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Note 9 - Share-based Payments (Details Textual) - USD ($) |  |  | 12 Months Ended | 13 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 04, 2018 | Feb. 21, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Mar. 01, 2017 | Dec. 31, 2016 | Dec. 12, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  | 10 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance |  |  | 624,256 | 764,430 |  |  | 850,232 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 0 | $ 3.31 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | $ 0 | $ 646,000 |  |  |  |
Allocated Share-based Compensation Expense, Total |  |  | 463,000 | 665,000 |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  | 0 | 0 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options |  |  | $ 262,000 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 1 year 62 days |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan |  |  | $ 39,000 | $ 66,000 |  |  |  |
Stock Repurchase Program, Additional Authorized Amount |  |  |  |  |  | $ 10,000,000 |  |
Stock Repurchased During Period, Shares |  |  |  | 551,936 | 17,549 |  |  |
Share Repurchase Program, Average Purchase Price Per Share |  |  |  | $ 9.28 | $ 8.39 |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.07 |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 9,883,000 |  | $ 9,883,000 |  |  |  |  |
Shares Issued, Price Per Share | $ 1.20 |  |  |  |  |  |  |
Number of Shares, Oversubscribed | 754,868 |  |  |  |  |  |  |
Dividends Payable, Date to be Paid |  | Mar. 21, 2018 |  |  |  |  |  |
Dividends Payable, Date of Record |  | Mar. 07, 2018 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  | 23,789 | 9,110 |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  | 17,549 | 551,936 |  |  |  |
Stock Issued During Period, Shares, New Issues | 8,306,535 |  | 8,306,535 |  |  |  |  |
Directors and Officers [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |  |  |
Other Employees [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 4 years |  |  |  |  |
The 2007 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  | 2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance |  |  | 624,256 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares, Authorized and Unissued |  |  | 870,838 |  |  |  |  |
The 2007 Equity Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |  |  |
The 2007 Equity Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 4 years |  |  |  |  |
The 1998 Incentive Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares, Authorized and Unissued |  |  | 0 |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  | 500,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 442,994 | 466,783 |  |  |  |
ESPP Participation Criteria, Maximum Percentage of Voting Power |  |  | 5.00% |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  | 23,789 | 9,110 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  |  | 85.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount on Purchase Price of Common Stock, Percent |  |  | 15.00% |  |  |  |  |
Employee Stock Purchase Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  | 2,500 |  |  |  |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan |  |  | $ 25,000 |  |  |  |  |

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