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Note 11 - Stock Option and Equity Incentive Plans - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based compensation expense $ 1,068 $ 1,056 $ 1,069
Common Stock [Member]      
Share-based compensation expense 505 505 513
Employee and Nonemployee Stock Option [Member]      
Share-based compensation expense 138 237 282
Restricted Stock Units (RSUs) [Member]      
Share-based compensation expense $ 425 $ 314 $ 274