Share-Based Payments - Summary of option activity under the equity plans (Details) - Stock options - $ / shares	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Shares
Exercised	(2,500)
Forfeited	(16,100)	(7,000)
Equity Plans
Shares
Outstanding at March 31, 2021	55,000
Granted	0
Exercised	(2,000)
Forfeited	(16,000)
Outstanding at March 31, 2022	37,000	55,000
Exercisable at March 31, 2022	37,000
Weighted Average Exercise Price
Outstanding at March 31, 2021	$ 11.73
Granted	0
Exercised	11.41
Forfeited	11.58
Outstanding at March 31, 2022	11.85	$ 11.73
Exercisable at March 31, 2022	$ 11.85
Weighted Average Remaining Contractual Term
Outstanding at March 31	1 year 5 months 12 days	2 years 1 month 2 days
Exercisable at March 31, 2022	1 year 5 months 12 days