CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net income	$ (34,341)	$ 6,091	$ 26,134
Adjustments to reconcile net income to net cash (used in)
Depreciation	1,369	1,327	1,190
Amortization of intangible assets	653	227	290
Stock-based compensation	1,612	813	753
Amortization of debt issue costs	73	62	157
Loss on debt extinguishment	0	0	90
Deferred income tax benefit	17,881	1,980	(19,860)
(Gain) loss on sale of property and equipment	27	(77)	1
Provision for inventory reserves	628	623	275
Provision for bad debts	65	10	0
Other	96	26	106
Changes in operating assets and liabilities:
Accounts receivable	(586)	4,407	(2,384)
Revenue earned but not billed	1,426	851	(2,370)
Inventories	1,879	(420)	(5,322)
Prepaid expenses and other assets	2,017	(888)	(396)
Accounts payable	2,372	(8,125)	(2,637)
Accrued expenses and other liabilities	2,209	(6,933)	5,797
Deferred revenue, current and long-term	329	(87)	(95)
Net cash (used in) provided by operating activities	(2,291)	(113)	1,729
Investing activities
Cash to fund acquisition, net of cash received	(5,600)	(4,012)	0
Cash paid for investment	0	(500)	0
Purchase of property and equipment	(586)	(518)	(902)
Additions to patents and licenses	(9)	(10)	(51)
Proceeds from sales of property, plant and equipment	0	122	7
Net cash used in investing activities	(6,195)	(4,918)	(946)
Financing activities
Payment of long-term debt	(15)	(14)	(35)
Proceeds from revolving credit facility	10,000	0	8,000
Payment of revolving credit facility	0	0	(18,013)
Payments to settle employee tax withholdings on stock-based compensation	(2)	(5)	(84)
Debt issue costs	(29)	(4)	(245)
Net proceeds from employee equity exercises	58	127	236
Net cash provided by (used in) financing activities	10,012	104	(10,141)
Net (decrease) increase in cash and cash equivalents	1,526	(4,927)	(9,358)
Cash and cash equivalents at beginning of period	14,466	19,393	28,751
Cash and cash equivalents at end of period	15,992	14,466	19,393
Supplemental cash flow information:
Cash paid for interest	(346)	(68)	(118)
Cash paid for income taxes	(87)	(203)	(175)
Supplemental disclosure of non-cash investing and financing activities:
Operating lease assets obtained in exchange for new operating lease liabilities	0	0	355
Issuance of common stock in connection with acquisition	$ 800	$ 0	$ 0