Note 4 - Capital Stock, Stock Plans and Stock-based Compensation - Stock-based Compensation Recognized (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Allocated stock-based compensation | $ 19,000 | $ 17,000 | $ 41,000 | $ 45,000 |
| Employee Stock Option [Member] | ||||
| Allocated stock-based compensation | 11,000 | 17,000 | 21,000 | 31,000 |
| Director Stock Options [Member] | ||||
| Allocated stock-based compensation | $ 8,000 | $ 20,000 | $ 14,000 | |
| 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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