| **Earnings Per Share**                                        | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| **Earnings Per Share, Diluted, Other Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Earnings Per Share                                            | Earnings Per ShareBasic net loss per share, or basic earnings/(loss) per share (“EPS”), is computed by dividing net loss to common shareholders by the weighted average number of common shares outstanding for the period.  We retired our preferred stock in 2011.Diluted EPS reflects the potential dilution that could occur if COB's potential common stock, which consists of dilutive stock options and a common stock warrant, were issued.  As required for entities with complex capital structures, a dual presentation of basic and diluted EPS is included on the face of the income statement, and a reconciliation of the numerator and denominator of the basic EPS computation to the numerator and denominator of the diluted EPS computation is provided in this note.(dollars in thousands, except per share data) For Three Months Ended For Six Months Ended  June 30, 2013 June 30, 2012 June 30, 2013 June 30, 2012Loss from continuing operations, net of tax $(3,183) $(18,138) $(7,779) $(28,970)Loss from discontinued operations, net of tax — — — (27)Net loss to common shareholders $(3,183) $(18,138) $(7,779) $(28,997)Weighted average number of common shares outstanding - basic and diluted 21,729,329 21,190,848 21,713,808 21,146,758Net loss per common share from continuing operations - basic and diluted $(0.15) $(0.86) $(0.36) $(1.37)Net loss per common share from discontinued operations - basic and diluted — — — —Net loss per common share - basic and diluted $(0.15) $(0.86) $(0.36) $(1.37)As a result of the net loss for the three and six months ended June 30, 2013 and 2012, all stock options and the common stock warrant were considered antidilutive and thus are not included in this calculation.  For the three months and six months ended June 30, 2013, there were 66,627 and 44,771 antidilutive shares, respectively. For the three and six months ended June 30, 2012, there were 23,027 antidilutive shares. Of the antidilutive shares, the number of shares relating to stock options were 44,555 for the three months ended June 30, 2013, 22,699 for the six months ended June 30, 2013, and 955 for both the three months and six months ended June 30, 2012, while the number relating to the warrant was 22,072 for all periods presented. |

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| - Definition
The entire disclosure for earnings per share.
+ References
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