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Note 7 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  | Number of Shares Underlying Options |  |  | Weighted Average Exercise Price |  |  | Number of Shares Underlying Options |  |  | Weighted Average Exercise Price |  |  | Number of Shares Underlying Options |  |  | Weighted Average Exercise Price |
Common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding - beginning of period |  |  | 1,316,068 |  |  | $ | 5.98 |  |  |  | 1,002,350 |  |  | $ | 7.50 |  |  |  | 1,004,750 |  |  | $ | 7.51 |
Options granted |  |  | - |  |  |  | - |  |  |  | 359,568 |  |  |  | 1.99 |  |  |  | - |  |  |  | - |
Options exercised |  |  | (119,822 | ) |  |  | 2.34 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Options forfeited |  |  | - |  |  |  | - |  |  |  | (8,700 | ) |  |  | 5.32 |  |  |  | (2,400 | ) |  |  | 8.61 |
Options expired |  |  | (921,500 | ) |  |  | 7.64 |  |  |  | (37,150 | ) |  |  | 8.72 |  |  |  | - |  |  |  | - |
Options outstanding - end of period |  |  | 274,746 |  |  | $ | 1.99 |  |  |  | 1,316,068 |  |  | $ | 5.98 |  |  |  | 1,002,350 |  |  | $ | 7.50 |
Options exercisable at end of period |  |  | 68,688 |  |  | $ | 1.99 |  |  |  | 956,500 |  |  | $ | 7.48 |  |  |  | 1,002,350 |  |  | $ | 7.50 |
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] |
| As of December 31, 2013 |
| Number of Options Outstanding |  |  | Exercise Price Per Share |  |  | Remaining Contractual Life |  |  | Number of Options Outstanding That Are Exercisable |  |  | Exercise Price per Share of Options That Are Exercisable |
|  |  |  |  |  |  |  |  | (in years) |  |  |  |  |  |  |  |  |
|  | 274,746 |  |  | $ | 1.99 |  |  |  | 7.3 |  |  |  | 68,688 |  |  | $ | 1.99 |
|  | 274,746 |  |  |  |  |  |  |  |  |  |  |  | 68,688 |  |  |  |  |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |
Restricted stock - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Granted |  |  | 382,062 |  |  |  | 5.20 |  |  |  | 432,396 |  |  |  | 1.65 |  |  |  | - |  |  |  | - |
Vested |  |  | (107,224 | ) |  |  | 7.16 |  |  |  | (432,396 | ) |  |  | 1.65 |  |  |  | - |  |  |  | - |
Outstanding - end of period |  |  | 274,838 |  |  | $ | 4.43 |  |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |
Restricted stock - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | - |  |  | $ | - |  |  |  | 10,000 |  |  | $ | 4.94 |  |  |  | 33,000 |  |  | $ | 5.74 |
Granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Vested |  |  | - |  |  |  | - |  |  |  | (10,000 | ) |  |  | 4.94 |  |  |  | (23,000 | ) |  |  | 6.08 |
Outstanding - end of period |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |  |  |  | 10,000 |  |  | $ | 4.94 |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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