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Note 4 - Capital Stock, Stock Plans and Stock-based Compensation (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 13, 2017 | May 15, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  | 6,000 | 50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  |  |  | $ 3.79 | $ 3.79
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  | $ 64,000 |  | $ 64,000 |
Employee Service Share-based Compensation Nonvested Awards, Compensation Not yet Recognized, Stock Options, Remainder of Fiscal Year |  |  |  | 18,000 |  | 18,000 |
Employee Service Share-based Compensation Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Two |  |  |  | 33,000 |  | 33,000 |
Employee Service Share-based Compensation Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Three |  |  |  | 13,000 |  | 13,000 |
Allocated Share-based Compensation Expense |  |  |  | 19,000 | $ 17,000 | 41,000 | $ 45,000
Employee Stock Option [Member] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  | $ 11,000 | $ 17,000 | $ 21,000 | $ 31,000
The 2003 Outside Directors Stock Plan [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  |  | 28,964 |
The 2003 Outside Directors Stock Plan [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | $ 110,000 |
The 2003 Outside Directors Stock Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | [1] | 10 years |  |  |  |  |
The 2003 Outside Directors Stock Plan [Member] | Director [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 6,000 |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  | $ 3.79 |  |  |  |  |
The 2003 Outside Directors Stock Plan [Member] | Director [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 180 days |  |  |  |  |
The 2010 Stock Option Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | [1] |  | 6 years |  |  |  |
The 2010 Stock Option Plan [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  | 6 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  | $ 3.97 |  |  |  |
The 2010 Stock Option Plan [Member] | Executive Vice President [Member] | Incentive Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  |  | 50,000 |  |  |  |
[1] | The expected option life is based on historical exercises and post-vesting data.

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