Selected Quarterly Financial Data From Continuing Operations (Summary Of Quarterly Financial Data) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Apr. 30, 2024	Jan. 31, 2024	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2023	Jan. 31, 2023	Oct. 31, 2022	Jul. 31, 2022	Apr. 30, 2024	Apr. 30, 2023
Quarterly Financial Data [Line Items]
Net sales	$ 81,141,893	$ 95,919,888	$ 98,691,684	$ 98,130,356	$ 108,288,073	$ 92,736,725	$ 108,221,068	$ 105,189,979	$ 373,883,821	$ 414,435,845
Gross profit	4,260,383	9,926,960	9,687,755	9,651,220	15,409,394	11,160,904	13,306,079	11,577,220	33,526,318	51,453,597
Income (loss) before income taxes	(3,918,053)	676,742	371,928	107,964	5,304,681	2,892,683	4,858,965	4,129,636	(2,761,419)	17,185,965
Net income (loss) from continuing operations	$ (3,375,524)	$ 599,006	$ 28,262	$ 262,099	$ 4,041,731	$ 2,949,459	$ 3,602,998	$ 3,600,236	$ (2,486,157)	$ 14,194,424
Earnings (loss) per share, Basic	$ (0.55)	$ 0.10	$ 0.00	$ 0.04	$ 0.67	$ 0.49	$ 0.59	$ 0.59	$ (0.41)	$ (3.39)
Earnings (loss) per share, Diluted	$ (0.55)	$ 0.10	$ 0.00	$ 0.04	$ 0.67	$ 0.49	$ 0.59	$ 0.58	$ (0.41)	$ (3.39)
Weighted-average shares - Basic	6,099,955	6,094,288	6,091,331	6,091,288	6,077,490	6,071,288	6,071,288	6,058,908	6,094,914	6,069,680
Weighted average shares- Diluted	6,099,955	6,120,317	6,190,696	6,100,284	6,077,490	6,071,288	6,145,223	6,191,395	6,094,914	6,069,680
Cost of products sold									$ 340,357,503	$ 362,982,248
Revision of Prior Period, Error Correction, Adjustment [Member]
Quarterly Financial Data [Line Items]
Net sales	$ (4,500,000)
Cost of products sold	(4,500,000)
Inventory Reserves For Valuation And Shrinkage [Member]
Quarterly Financial Data [Line Items]
Income (loss) before income taxes	$ (1,865,000)				$ 650,000
Provision for inventory reserves					$ 1,900,000