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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
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income $ 2,271 $ 4,946 $ 2,131 $ 2,175 $ 5,221 $ 7,267 $ 5,998 $ 564 $ 11,523 $ 19,050 $ 27,902
Basic (in shares)                 9,854 9,788 9,741
Effect of potentially dilutive common shares (in shares) [1]                 74 85 38
Diluted weighted-average common shares outstanding (in shares)                 9,928 9,873 9,779
Basic (in dollars per share) $ 0.23 $ 0.50 $ 0.22 $ 0.22 $ 0.54 $ 0.74 $ 0.61 $ 0.06 $ 1.17 $ 1.95 $ 2.86
Diluted (in dollars per share) $ 0.23 $ 0.50 $ 0.21 $ 0.22 $ 0.53 $ 0.73 $ 0.61 $ 0.06 $ 1.16 $ 1.93 $ 2.85
[1] There were no antidilutive shares for the years ended December 31, 2021, 2020 or 2019.