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Note 5 - Capital Stock, Stock Plans and Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2016
Notes Tables |
Schedule of Stock Options Roll Forward [Table Text Block] |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term ( years) |  |  | Aggregate Intrinsic Value (2) |
Options outstanding January 1, 2016 |  |  | 218,200 |  |  | $ | 7.65 |  |  |  |  |  |  |  |  |
Granted |  |  | 50,000 |  |  |  | 3.97 |  |  |  |  |  |  |  |  |
Exercised |  |  | ─ |  |  |  | ─ |  |  |  |  |  |  |  |  |
Forfeited/expired |  |  | ─ |  |  |  | ─ |  |  |  |  |  |  |  |  |
Options outstanding end of period (1) |  |  | 268,200 |  |  | $ | 6.96 |  |  |  | 4.6 |  |  | $ | 134,102 |
Options exercisable at June 30, 2016 (1) |  |  | 181,533 |  |  | $ | 8.18 |  |  |  | 4.4 |  |  | $ | 74,802 |
Options exercisable and expected to be vested at June 30, 2016 |  |  | 254,883 |  |  | $ | 7.10 |  |  |  | 4.6 |  |  | $ | 125,230 |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (2) |
Options outstanding Janury 1, 2015 |  |  | 239,023 |  |  | $ | 7.81 |  |  |  |  |  |  |  |  |
Granted |  |  | ─ |  |  |  | ─ |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,388 | ) |  |  | 2.79 |  |  |  |  |  |  | $ | 3,248 |
Forfeited/expired |  |  | (15,000 | ) |  |  | 7.10 |  |  |  |  |  |  |  |  |
Options outstanding end of period (1) |  |  | 221,635 |  |  |  | 7.91 |  |  |  | 4.7 |  |  | $ | 18,869 |
Options exercisable at June 30, 2015 (1) |  |  | 166,635 |  |  | $ | 8.88 |  |  |  | 4.6 |  |  | $ | 18,869 |
Options exercisable and expected to be vested at June 30, 2015 |  |  | 212,835 |  |  | $ | 8.04 |  |  |  | 4.7 |  |  | $ | 18,869 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Employee Stock Option Granted May 15, 2016 |
Weighted-average fair value per share |  | $ | 2.00 |
Risk -free interest rate (1) |  |  | 1.27 | %
Expected volatility of stock (2) |  |  | 53.12 | %
Dividend yield |  |  | None |
Expected option life (in years) (3) |  |  | 6.0 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
Stock Options |  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Employee Stock Options |  | $ | 17,000 |  |  | $ | 13,000 |  |  | $ | 31,000 |  |  | $ | 26,000 |
Director Stock Options |  |  | — |  |  |  | — |  |  |  | 14,000 |  |  |  | 20,000 |
Total |  | $ | 17,000 |  |  | $ | 13,000 |  |  | $ | 45,000 |  |  | $ | 46,000 |

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