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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Total share-based compensation $ 427 $ 441 $ 636 $ 642
Board of Directors [Member] | Common Stock Issued Under the Equity Incentive Plan [Member]        
Total share-based compensation 105 105 105 105
Chief Executive Officer [Member] | Common Stock Issued Under the Equity Incentive Plan [Member]        
Total share-based compensation 100 100 200 200
Directors and Employees [Member] | Employee Stock Option [Member]        
Total share-based compensation 117 141 126 177
Employees [Member] | Restricted Stock Units (RSUs) [Member]        
Total share-based compensation $ 105 $ 95 $ 205 $ 160