CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Income Statement [Abstract]
Net sales	$ 54,436,000	$ 70,760,000	$ 98,112,000	$ 131,528,000
Cost of sales	28,474,000	37,723,000	53,111,000	69,508,000
Gross profit	25,962,000	33,037,000	45,001,000	62,020,000
Operating expenses:
Research and development	1,557,000	1,457,000	3,313,000	2,977,000
Selling, marketing, and distribution	13,924,000	15,664,000	25,704,000	28,864,000
General and administrative	10,615,000	10,615,000	21,679,000	20,654,000
Total operating expenses	26,096,000	27,736,000	50,696,000	52,495,000
Operating (loss)/income	(134,000)	5,301,000	(5,695,000)	9,525,000
Other income, net:
Other income, net	585,000	619,000	826,000	747,000
Interest expense, net	(242,000)	(53,000)	(428,000)	(99,000)
Total other income, net	343,000	566,000	398,000	648,000
Income/(loss) from operations before income taxes	209,000	5,867,000	(5,297,000)	10,173,000
Income tax (benefit)/expense	(161,000)	1,284,000	28,000	2,133,000
Net income/(loss)	$ 370,000	$ 4,583,000	$ (5,325,000)	$ 8,040,000
Net income/(loss) per share:
Basic	$ 0.03	$ 0.32	$ (0.40)	$ 0.57
Diluted	$ 0.03	$ 0.32	$ (0.40)	$ 0.56
Weighted average number of common shares outstanding:
Basic	13,465	14,135	13,454	14,109
Diluted	13,589	14,348	13,454	14,369