Unaudited Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Statement of Financial Position [Abstract]
Trade accounts receivable, allowance for doubtful accounts	$ 360	$ 357
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, authorized (in shares)	2,000,000	2,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, authorized (in shares)	70,000,000	70,000,000
Common stock, issued (in shares)	42,823,000	42,808,000
Common stock, outstanding (in shares)	42,823,000	42,808,000