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Note 16 - Stockholders' Equity (Details Textual) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 01, 2017 | Jul. 17, 2012 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 10, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  |  | 110.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Minimum Ownership Percentage to Trigger Greater than Fair Value Purchase Price |  |  | 10.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  | 3 years 273 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  | 0.00% |  |  |
Dividends, Common Stock, Cash |  |  | $ 0 |  |  |
Allocated Share-based Compensation Expense |  |  | 21,000 | $ 34,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | 364,000 |  |  |
Expected Recognized Compensation Expenses Next Year |  |  | 172,000 |  |  |
Expected Recognized Compensation Expenses in Year Two |  |  | 92,000 |  |  |
Expected Recognized Compensation Expenses in Year Three |  |  | $ 56,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 476,144 | 143,094 | 154,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  | 4,906 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 350,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 50,000 |  |  |
Warrants and Rights Outstanding |  |  |  | $ 817,880 |  |
Note and Warrant Purchase Agreement [Member] |  |  |  |  |  |
Notes Payable |  | $ 5,000,000 | $ 831,000 |  |  |
Warrants Issued in Connection with the Note and Warrant Purchase Agreement [Member] |  |  |  |  |  |
Warrants Term |  | 1 year 180 days |  |  |  |
Percentage of Common Stock Issued |  | 4.00% |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.01 |  |  |  |
Warrants and Rights Outstanding |  | $ 703,000 |  |  |  |
President [Member] | Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 25,000 |  |  |  |  |
President [Member] | Employee Stock Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 65,000 |  |  |  |  |
President [Member] | Non-qualified Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 260,000 |  |  |  |  |
Stock Incentive Plan 2009 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 510,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 399,469 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares |  |  | 26,788 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares |  |  | 372,681 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 0 | 4,906 |  |
Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  | 1.40% |  |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  |  | 2.20% |  |  |

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