SEGMENT REPORTING AND SALES BY MAJOR CUSTOMER - Professional Services (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Segment Reporting Information [Line Items]
Revenues from customers	$ 83,968	$ 78,376
Interest expense	2,177	2,447
Depreciation and amortization	6,744	6,068
Operating income (loss)	16,827	13,239
Gaming
Segment Reporting Information [Line Items]
Revenues from customers	38,267	38,577
Interest expense	1,809	2,122
Depreciation and amortization	3,207	3,014
Operating income (loss)	9,142	8,916
Aircraft Modification
Segment Reporting Information [Line Items]
Revenues from customers	29,587	25,061
Interest expense	313	229
Depreciation and amortization	3,256	2,790
Operating income (loss)	4,415	358
Aircraft Avionics
Segment Reporting Information [Line Items]
Revenues from customers	3,377	2,722
Interest expense	0	0
Depreciation and amortization	27	20
Operating income (loss)	(306)	(562)
Special Mission Electronics
Segment Reporting Information [Line Items]
Revenues from customers	12,737	11,953
Interest expense	49	63
Depreciation and amortization	137	125
Operating income (loss)	5,125	4,726
Other
Segment Reporting Information [Line Items]
Revenues from customers	0	63
Interest expense	6	33
Depreciation and amortization	117	119
Operating income (loss)	$ (1,549)	$ (199)