Income Taxes - Income tax expense reflects an effective U.S tax rate (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2022	Mar. 31, 2021
Schedule Of Income Taxes [Line Items]
Income tax expense at Federal statutory rate									$ 855	$ 2,303
Increase (decrease) resulting from:
State income taxes, net of Federal benefit									142	378
Other									51	(86)
Income tax expense	$ 122	$ (209)	$ 536	$ 599	$ 884	$ 1,190	$ 92	$ 429	$ 1,048	$ 2,595