CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Cash flows from operating activities:
Net (loss)/income	$ (5,695)	$ 3,457
Adjustments to reconcile net income to net cash (used in)/provided by operating activities:
Depreciation and amortization	4,162	4,179
Loss on sale/disposition of assets		127
Provision for credit losses on accounts receivable	7	23
Deferred income taxes		(110)
Stock-based compensation expense	714	752
Changes in operating assets and liabilities:
Accounts receivable	4,952	3,939
Inventories	1,045	(17,746)
Prepaid expenses and other current assets	(2,263)	(1,924)
Income taxes	159	869
Accounts payable	277	4,226
Accrued payroll and incentives	195	(3,532)
Right of use assets	426	403
Accrued profit sharing	(178)	248
Accrued expenses	1,781	2,479
Other assets	(33)	39
Lease liabilities	(481)	(443)
Other non-current liabilities		(151)
Net cash provided by/(used in) operating activities	5,068	(3,165)
Cash flows from investing activities:
Payments to acquire patents and software	(1,392)	(449)
Payments to acquire property and equipment	(218)	(537)
Net cash used in investing activities	(1,610)	(986)
Cash flows from financing activities:
Payments on notes and loans payable	(5,170)
Cash paid for debt issuance costs	(88)
Proceeds from exercise of options to acquire common stock, including employee stock purchase plan		5
Payment of employee withholding tax related to restricted stock units	(252)	(312)
Net cash used in financing activities	(5,510)	(307)
Net decrease in cash and cash equivalents	(2,052)	(4,458)
Cash and cash equivalents, beginning of period	19,521	60,801
Cash and cash equivalents, end of period	17,469	56,343
Supplemental disclosure of cash flow information Cash paid for:
Interest	161	38
Income taxes	$ 32	$ 85