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Income Taxes - Income tax expense (benefit) reflects an effective U.S tax rate (Details 2) - USD ($)
$ 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
Schedule Of Income Taxes [Line Items]                    
Income tax expense (benefit) at Federal statutory rate                 $ 2,303 $ 479
Increase (decrease) resulting from:                    
State income taxes, net of Federal benefit                 378 91
Other                 (86) (13)
Income tax expense (benefit) $ 884 $ 1,190 $ 92 $ 429 $ (1,746) $ 229 $ 92 $ 206 $ 2,595 (1,219)
Fiscal Year 2020 Net Operating Losses                    
Increase (decrease) resulting from:                    
Federal NOL rate differential                   (414)
Fiscal Year 2019 Net Operating Losses                    
Increase (decrease) resulting from:                    
Federal NOL rate differential                   $ (1,362)