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Note 4 - Capital Stock, Stock Plans and Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 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 |  |  |  | 4.7 |  |  | $ | 4,380 |
Options exercisable at March 31, 2017 (1) |  |  | 163,867 |  |  | $ | 7.87 |  |  |  | 4.5 |  |  | $ | 4,380 |
Options exercisable and expected to be vested at March 31, 2017 |  |  | 223,200 |  |  | $ | 6.84 |  |  |  | 4.7 |  |  | $ | 4,380 |
|  | 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 |  | ─ |  |  | ─ |  |  |  |  |  |  |  |  |
Exercised |  | ─ |  |  | ─ |  |  |  |  |  |  |  |  |
Forfeited/expired |  | ─ |  |  | ─ |  |  |  |  |  |  |  |  |
Options outstanding end of period (1) |  |  | 218,200 |  |  | $ | 7.65 |  |  |  | 4.6 |  |  | $ | 13,980 |
Options exercisable at March 31, 2016 (1) |  |  | 181,533 |  |  | $ | 8.18 |  |  |  | 4.6 |  |  | $ | 13,980 |
Options exercisable and expected to be vested at March 31, 2016 |  |  | 212,333 |  |  | $ | 7.72 |  |  |  | 4.6 |  |  | $ | 13,980 |
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 (3) (years) |  | 10.0 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended |
Stock Options |  | March 31, |
|  | 2017 |  |  | 2016 |
Employee Stock Options |  | $ | 11,000 |  |  | $ | 13,000 |
Director Stock Options |  |  | 12,000 |  |  |  | 15,000 |
Total |  | $ | 23,000 |  |  | $ | 28,000 |

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