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Note 5 - Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015 |  |  | 239,023 |  |  | $ | 7.81 |  |  |  |  |  |  |  |  |
Granted |  |  | 12,000 |  |  |  | 4.19 |  |  |  |  |  |  |  |  |
Exercised |  |  | (3,423 | ) |  |  | 2.79 |  |  |  |  |  |  | $ | 4,298 |
Forfeited/Expired |  |  | (29,400 | ) |  |  | 8.13 |  |  |  |  |  |  |  |  |
Options outstanding End of Period (1) |  |  | 218,200 |  |  | $ | 7.65 |  |  |  | 4.8 |  |  | $ | 14,676 |
Options Exercisable at December 31, 2015 (1) |  |  | 169,533 |  |  | $ | 8.47 |  |  |  | 4.5 |  |  | $ | 14,676 |
Options Vested and expected to be vested at December 31, 2015 |  |  | 212,333 |  |  | $ | 7.72 |  |  |  | 4.8 |  |  | $ | 14,676 |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value (2) |
Options outstanding January 1, 2014 |  |  | 362,800 |  |  | $ | 9.53 |  |  |  |  |  |  |  |  |
Granted |  |  | 71,800 |  |  |  | 4.70 |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,577 | ) |  |  | 2.79 |  |  |  |  |  |  | $ | 3,705 |
Forfeited/Expired |  |  | (193,000 | ) |  |  | 9.95 |  |  |  |  |  |  |  |  |
Options outstanding End of Period (1) |  |  | 239,023 |  |  | $ | 7.81 |  |  |  | 4.9 |  |  | $ | 41,957 |
Options Exercisable at December 31, 2014 (1) |  |  | 167,223 |  |  | $ | 9.15 |  |  |  | 4.2 |  |  | $ | 31,037 |
Options Vested and expected to be vested at December 31, 2014 |  |  | 230,223 |  |  | $ | 7.92 |  |  |  | 4.9 |  |  | $ | 41,957 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant-Date Fair Value |
Non-vested options January 1, 2015 |  |  | 71,800 |  |  | $ | 2.85 |
Granted |  |  | 12,000 |  |  |  | 2.84 |
Vested |  |  | (35,133 | ) |  |  | 2.81 |
Non-vested options at December 31, 2015 |  |  | 48,667 |  |  | $ | 2.87 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Outside Director Stock Options Granted |
|  | For Year Ended |
|  | 2015 |  |  | 2014 |
Weighted-average fair value per share |  | $ | 2.84 |  |  | $ | 2.73 |
Risk -free interest rate (1) |  |  | 2.21 | % |  |  | 2.63 | %
Expected volatility of stock (2) |  |  | 57.98 | % |  |  | 59.59 | %
Dividend yield |  |  | None |  |  |  | None |
Expected option life (3) (in years) |  |  | 10.0 |  |  |  | 10.0 |
|  | Employee Stock Option Granted |
|  | For Year Ended 2014 |
Weighted-average fair value per share |  | $ | 2.88 |
Risk -free interest rate (1) |  |  | 1.91% |
Expected volatility of stock (2) |  |  | 61.84% |
Dividend yield |  |  | None |
Expected option life (3) (in years) |  |  | 6.0 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year Ended |
|  | 2015 |  |  | 2014 |
Employee Stock Options |  | $ | 53,000 |  |  | $ | (14,000 | )
Director Stock Options |  |  | 39,000 |  |  |  | 48,000 |
Total |  | $ | 92,000 |  |  | $ | 34,000 |

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