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Note 4 - Capital Stock, Stock Plans and Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2017 |  |  | 247,200 |  |  | $ | 6.69 |  |  |  |  |  |  |  |  |
Granted |  |  | 6,000 |  |  |  | 3.79 |  |  |  |  |  |  |  |  |
Exercised |  |  | ─ |  |  |  | ─ |  |  |  |  |  |  |  |  |
Forfeited/expired |  |  | (30,000 | ) |  |  | 5.00 |  |  |  |  |  |  |  |  |
Options outstanding end of period (1) |  |  | 223,200 |  |  | $ | 6.84 |  |  |  | 4.5 |  |  | $ | 13,080 |
Options exercisable at June 30, 2017 (1) |  |  | 180,534 |  |  | $ | 7.51 |  |  |  | 4.3 |  |  | $ | 13,080 |
Options exercisable and expected to be vested at June 30, 2017 |  |  | 223,200 |  |  | $ | 6.84 |  |  |  | 4.5 |  |  | $ | 13,080 |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (2) |
Options outstanding January 1, 2016 |  |  | 218,000 |  |  | $ | 7.65 |  |  |  |  |  |  |  |  |
Granted |  |  | 50,000 |  |  |  | 3.79 |  |  |  |  |  |  |  |  |
Exercised |  |  | ─ |  |  |  | ─ |  |  |  |  |  |  |  |  |
Forfeited/expired |  |  | ─ |  |  |  | ─ |  |  |  |  |  |  |  |  |
Options outstanding end of period (1) |  |  | 268,000 |  |  | $ | 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 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Outside Director Stock Options Granted |
|  | January 13, 2017 |
Weighted-average fair value per option |  | $ | 2.63 |
Risk -free interest rate (1) |  |  | 2.40% |
Expected volatility of stock (2) |  |  | 56.32% |
Dividend yield |  |  | None |
Expected option life (years) (3) |  |  | 10.0 |
|  | 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 (years) (3) |  |  | 6.0 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
Stock Options |  | June 30, |  |  | June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Employee Stock Options |  | $ | 11,000 |  |  | $ | 17,000 |  |  | $ | 21,000 |  |  | $ | 31,000 |
Director Stock Options |  |  | 8,000 |  |  |  | — |  |  |  | 20,000 |  |  |  | 14,000 |
Total |  | $ | 19,000 |  |  | $ | 17,000 |  |  | $ | 41,000 |  |  | $ | 45,000 |

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