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Note 11 - Stockholders' Equity (Details Textual) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 12, 2007 | Nov. 30, 2006 | Jun. 15, 1989
The 1989 Non-qualified Stock Option Plan [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 5 years |  |  |  |  |
The 1989 Non-qualified Stock Option Plan [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 7 years |  |  |  |  |
The 1989 Non-qualified Stock Option Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 0 | 0 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  | 700,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 0 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 35,250 | 35,250 | 35,250 |  |  |
The 2001 Non-qualified Stock Option Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 0 | 28,000 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  | 300,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 0 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 124,480 | 124,480 | 152,480 |  |  |
The 2007 Share Incentive Plan [Member] | Directors and Key Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 36,108 | 42,320 |  |  |  |
The 2007 Share Incentive Plan [Member] | Key Employee [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 100,000 |  |  |  |
The 2007 Share Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 0 | 0 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  | 750,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 100,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 100,000 | 100,000 | 0 |  |  |
Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 7 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 170,000 | $ 135,000 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 44,000 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 127 days |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 288,000 | 383,000 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 1,187,000 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 193 days |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ 751,000 | $ 516,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 0 | 28,000 |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |  |  |  |
Allocated Share-based Compensation Expense | $ 750,758 | $ 515,933 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 259,730 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 310,520 |  |  |  |

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