| **Note 2 - Long-Term Incentive Plans (Tables)**                                                                 | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Disclosure of Compensation Related Costs, Share-based Payments [Abstract]**                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]                  | ** **** **
**Three Months**
** **** **** **
**Ended March 31,**
** **** **** **
**2014******
** **** **
**2013******
** **
Expected volatility
                                                78.39                  %                                                        76.23                  %        
Risk-free interest rate
                                                2.00                  %                                                        1.06                  %        
Expected dividend yield
                                                0.00                  %                                                        0.00                  %        
Expected life (in years)
                                                6.0                                                                           6.0                           
Estimated fair value per option granted
                             $                  1.86                                                        $                  0.87                    |
| Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]                                | ** **** **
**Number of**
** **** **** **
**Options**
** **
Outstanding at January 1, 2014
                                                5,994,788                           
Granted
                                                495,000                           
Exercised
                                                (241,627                  )        
Forfeited and cancelled
                                                (7,655                  )        
Outstanding at March 31, 2014
                                                6,240,506                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]                  | ** **** **
**Shares**
** **
Nonvested at January 1, 2014
                                                -                           
Granted
                                                125,803                           
Nonvested at March 31, 2014
                                                125,803                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] | ** **** **
**Three Months**
** **** **** **
**Ended March 31,**
** **** **** **
**2014**
** **** **
**2013******
** **
Cost of sales
                             $                  24                                                        $                  17                           
Research and development
                                                98                                                                           87                           
Selling, general and administrative
                                                168                                                                           236                                                                           $                  290                                                        $                  340                                                                                                                                                                                                                                                |

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| - Definition
Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.
+ References
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| - Definition
Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.
+ References
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| - Definition
Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.
+ References
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| - Definition
Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.
+ References
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