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Note 2 - Summary of Significant Accounting Policies - Loss Per Basic and Diluted Weighted Average Common Share Outstanding for Continuing and Discontinued Operations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income $ 19,050 $ 27,902 $ 20,312
Basic (in shares) 9,788 9,741 9,726
Effect of potentially dilutive common shares (in shares) [1] 85 38 7
Diluted weighted-average common shares outstanding (in shares) 9,873 9,779 9,733
Net income per common share      
Basic (in dollars per share) $ 1.95 $ 2.86 $ 2.09
Diluted (in dollars per share) $ 1.93 $ 2.85 $ 2.09
[1] There were no antidilutive shares for the years ended December 31, 2020 or 2019. The weighted-average number of antidilutive shares not included in the computation of diluted net income per share was approximately 63,000 for the year ended December 31, 2018, including approximately 39,000 of PSAs, at the target level of 100%, that were not included because the performance conditions had not been met as of December 31, 2018.