Note 5 - Capital Stock, Stock Plans and Stock-based Compensation - Stock-based Compensation Recognized (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
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| Employee Stock Option [Member] | ||||
| Allocated stock-based compensation | $ 12,000 | $ 13,000 | $ 42,000 | $ 39,000 |
| Director Stock Options [Member] | ||||
| Allocated stock-based compensation | 13,000 | 2,000 | 27,000 | 23,000 |
| Allocated stock-based compensation | $ 25,000 | $ 15,000 | $ 69,000 | $ 62,000 |
| X | ||||||||||
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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