Note 16 - Segment Reporting and Sales by Major Customer - Professional Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023
Revenues from customers	$ 19,828	$ 17,185
Interest expense	565	639
Depreciation and amortization	1,596	1,423
Operating income (loss)	3,536	1,137
Gaming [Member]
Revenues from customers	9,236	8,989
Interest expense	491	556
Depreciation and amortization	792	648
Operating income (loss)	2,754	2,314
Aircraft Modification [Member]
Revenues from customers	7,106	5,483
Interest expense	59	58
Depreciation and amortization	744	713
Operating income (loss)	555	(793)
Aircraft Avionics [Member]
Revenues from customers	461	744
Interest expense	0	0
Depreciation and amortization	6	3
Operating income (loss)	(55)	(86)
Special Mission Electronics [Member]
Revenues from customers	3,025	1,917
Interest expense	14	16
Depreciation and amortization	34	32
Operating income (loss)	1,384	721
Product and Service, Other [Member]
Revenues from customers	0	52
Interest expense	1	9
Depreciation and amortization	20	27
Operating income (loss)	$ (1,102)	$ (1,019)