Restricted Stock Plan (Details) - Restricted stock - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2018	Dec. 31, 2017
Weighted Average Grant Date Fair Value
Stock-based compensation expense recognized in earnings	$ 24
Stock based compensation expense, net of tax	17
Total unrecognized compensation cost related to non-vested restricted stock units	$ 205
Employees
Shares
Non-vested balance at beginning of period (in shares)	28,000
Granted (in shares)	28,000
Non-vested balance at end of period (in shares)	28,000
Weighted Average Grant Date Fair Value
Non-vested balance at beginning of period (in dollars per share)	$ 8.99
Non-vested balance at end of period (in dollars per share)	$ 8.99
Restricted Stock Plan
Stock options
Shares reserved for issuance	405,805
Weighted Average Grant Date Fair Value
Stock-based compensation expense recognized in earnings		$ 4
Stock based compensation expense, net of tax		$ 3
Total unrecognized compensation cost related to non-vested restricted stock units	$ 0
Restricted Stock Plan | Employees
Shares
Granted (in shares)			9,000	5,000
Non-vested balance at end of period (in shares)	0
Restricted Stock Plan | Employees | Minimum
Stock options
Vesting period (in years)			2 years	2 years
Restricted Stock Plan | Employees | Maximum
Stock options
Vesting period (in years)			3 years	3 years