**Exhibit 24**

 

POWER OFATTORNEY

 

Each person whose signature appears below oron a counterpart of this power of attorney, constitutes and appointsCURTIS A. SAMPSON and PAUL N. HANSON as his true and lawful attorneys-in-factand agents, each acting alone, with full power of substitution andresubstitution, for him and in his name, place and stead, in any and allcapacities, to sign any or all amendments to this Annual Report on Form 10-Kand to file the same, with all exhibits thereto, and other documents in connectiontherewith, with the Securities and Exchange Commission, granting unto saidattorneys-in-fact and agents, each acting alone, full power and authority to doand perform each and every act and thing requisite and necessary to bedone in and about the premises, as fully to all intents and purposes as hemight or could do in person, hereby ratifying and confirming all saidattorneys-in-fact and agents, each acting alone, or his substitute orsubstitutes, may lawfully do or cause to be done by virtue thereof.

 
| **Signature**            | ** ** | **Title** | ** **                           | **Date** |
|--------------------------|------------|-----------|--------------------------------------|----------|
|                     |       |      |                                 |     |
| /s/Curtis A. Sampson     |       |      | Chairman of the Board of Directors,  |     | March 27,  2006 |
| Curtis A. Sampson        |       |      | Chief Executive Officer and Director |     |   |
|                     |       |      |                                 |     |   |
| /s/Steven H. Sjogren     |       |      | President, Chief Operating Officer,  |     | March 27,  2006 |
| Steven H. Sjogren        |       |      | and Director                         |     |   |
|                     |       |      |                                 |     |   |
| /s/Paul N.  Hanson       |       |      | Vice President, Treasurer and        |     | March 27,  2006 |
| Paul N. Hanson           |       |      | Director                             |     |   |
|                     |       |      |                                 |     |   |
| /s/Charles A. Braun      |       |      | Chief Financial Officer and          |     | March 27,  2006 |
| Charles A. Braun         |       |      | Principal Accounting Officer         |     |   |
|                     |       |      |                                 |     |   |
| /s/Ronald J. Bach        |       |      | Director                             |     | March 27,  2006 |
| Ronald J. Bach           |       |      |                                 |     |   |
|                     |       |      |                                 |     |   |
| /s/James O. Ericson      |       |      | Director                             |     | March 27,  2006 |
| James O. Ericson         |       |      |                                 |     |   |
|                     |       |      |                                 |     |   |
| /s/Luella Gross Goldberg |       |      | Director                             |     | March 27,  2006 |
| Luella Gross Goldberg    |       |      |                                 |     |   |
|                     |       |      |                                 |     |   |
| /s/Paul A. Hoff          |       |      | Director                             |     | March 27,  2006 |
| Paul A. Hoff             |       |      |                                 |     |   |
|                     |       |      |                                 |     |   |
| /s/Gerald D. Pint        |       |      | Director                             |     | March 27,  2006 |
| Gerald D. Pint           |       |      |                                 |     |   |
|                     |       |      |                                 |     |   |
| /s/Wayne E. Sampson      |       |      | Director                             |     | March 27,  2006 |
| Wayne E. Sampson         |       |      |                                 |     |   |

 

87

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