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Note 4 - Share-based Compensation - Allocation of Share-based Compensation (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Total share-based compensation $ 209 $ 201
Employee Stock Option [Member] | Directors and Employees [Member]    
Total share-based compensation 9 36
Common Stock [Member] | Chief Executive Officer [Member]    
Total share-based compensation 100 100
Restricted Stock Units (RSUs) [Member] | Employees [Member]    
Total share-based compensation $ 100 $ 65