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Summary of Significant Accounting Policies - Income per share (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Numerator:                    
Net income per consolidated statements of income $ 1,869 $ 3,785 $ 1,267 $ 1,430 $ 2,296 $ 311 $ 268 $ 591 $ 8,351 $ 3,466
Percentage allocated to shareholders *                 99.00% 99.00%
Numerator for basic and diluted earnings per share                 $ 8,307 $ 3,434
Denominator:                    
Denominator for Basic earnings per share - weighted-average shares outstanding                 7,626 7,702
Dilutive effect of stock options                   1
Denominator for diluted earnings per share                 7,626 7,703
Per share income from continuing operations                    
Basic (in dollars per share) $ 0.24 $ 0.49 $ 0.16 $ 0.18 $ 0.31 $ 0.04 $ 0.03 $ 0.07 $ 1.09 $ 0.45
Diluted (in dollars per share) $ 0.24 $ 0.49 $ 0.16 $ 0.18 $ 0.31 $ 0.04 $ 0.03 $ 0.07 $ 1.09 $ 0.45