CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Income Statement [Abstract]
Revenues	$ 25,395	$ 34,757	$ 63,121	$ 71,449
Cost of revenues	30,060	30,610	63,686	58,185
Gross profit (loss)	(4,665)	4,147	(565)	13,264
Operating expenses:
Selling, general and administrative	6,557	6,831	12,820	13,213
Total operating expenses	6,557	6,831	12,820	13,213
Operating income (loss)	(11,222)	(2,684)	(13,385)	51
Interest expense	(827)	(877)	(1,652)	(1,718)
Other income, net	140	145	398	195
Net loss before income taxes	(11,909)	(3,416)	(14,639)	(1,472)
Income tax benefit	(2,388)	(2,896)	(2,996)	(2,313)
Net income (loss)	(9,521)	(520)	(11,643)	841
Comprehensive income (loss)	$ (9,521)	$ (520)	$ (11,643)	$ 841
Net income (loss) per share:
Basic	$ (0.15)	$ (0.01)	$ (0.18)	$ 0.01
Diluted	$ (0.15)	$ (0.01)	$ (0.18)	$ (0.00)
Weighted average common shares outstanding:
Basic	63,149	62,204	62,994	62,054
Diluted	63,149	62,204	62,994	70,350