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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Allocated share based compensation $ 1,807 $ 1,591 $ 1,212
Common Stock [Member]      
Allocated share based compensation 400 400 505
Employee and Nonemployee Stock Option [Member]      
Allocated share based compensation 232 151 149
Restricted Stock Units (RSUs) [Member]      
Allocated share based compensation $ 1,175 $ 1,040 $ 558