CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowance for expected credit losses	$ 1,021	$ 915
Property, plant and equipment, accumulated depreciation	$ 78,510	$ 72,944
Common shares, par value (USD per share)	$ 0.01	$ 0.01
Common shares, authorized (shares)	50,000,000	50,000,000
Common shares, issued (shares)	16,284,000	16,162,000
Preferred shares, par value (USD per share)	$ 0.01	$ 0.01
Preferred shares, authorized (shares)	10,000,000	10,000,000
Preferred shares, issued (shares)	0	0
Treasury shares, at cost (shares)	454,000	511,000