Income Taxes - Income tax expense (Details) - 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
Current:
Federal									$ 116	$ 969
State									35
Total current									151	969
Deferred:
Federal									800	1,447
State									97	179
Total deferred									897	1,626
Income tax expense	$ 122	$ (209)	$ 536	$ 599	$ 884	$ 1,190	$ 92	$ 429	$ 1,048	$ 2,595