CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total
Beginning Balance - Shares at Mar. 31, 2021	24,020,276
Beginning Balance - Amount at Mar. 31, 2021	$ 24	$ 47,722	$ (20)	$ 27,866	$ 75,592
Issuance of common stock under employee stock option plans, shares	145,786
Issuance of common stock under employee stock option plans, amount		783			783
Stock-based compensation expense		823			823
Comprehensive loss:
Net loss				(4,209)	(4,209)
Net unrealized loss on available-for-sale investments			(15)		(15)
Ending Balance, Shares at Jun. 30, 2021	24,166,062
Ending Balance, Amount at Jun. 30, 2021	$ 24	49,328	(35)	23,657	72,974
Beginning Balance - Shares at Mar. 31, 2022	24,486,239
Beginning Balance - Amount at Mar. 31, 2022	$ 24	53,083	(154)	11,498	64,451
Issuance of common stock under employee stock option plans, shares	67,514
Issuance of common stock under employee stock option plans, amount	$ 1	178			179
Stock-based compensation expense		638			638
Comprehensive loss:
Net loss				(3,976)	(3,976)
Net unrealized loss on available-for-sale investments			(27)		(27)
Ending Balance, Shares at Jun. 30, 2022	24,553,753
Ending Balance, Amount at Jun. 30, 2022	$ 25	$ 53,899	$ (181)	$ 7,522	$ 61,265