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Note 12 - Stock Option and Equity Incentive Plans - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based compensation expense $ 1,212 $ 1,068 $ 1,056
Common Stock [Member]      
Share-based compensation expense 505 505 505
Employee and Nonemployee Stock Option [Member]      
Share-based compensation expense 149 138 237
Restricted Stock Units (RSUs) [Member]      
Share-based compensation expense $ 559 $ 425 $ 314