Note 16 - Segment Reporting and Sales by Major Customer - Professional Services (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Revenues	$ 75,182	$ 71,517
Interest expense	2,743	2,689
Depreciation and amortization	5,898	5,281
Gaming [Member]
Revenues	37,758	36,813
Interest expense	2,419	2,440
Depreciation and amortization	2,742	2,454
Aircraft Modification [Member]
Revenues	24,016	21,399
Interest expense	251	215
Depreciation and amortization	2,718	2,384
Aircraft Avionics [Member]
Revenues	2,324	2,373
Interest expense	0	0
Depreciation and amortization	11	5
Special Mission Electronics [Member]
Revenues	10,801	10,554
Interest expense	47	23
Depreciation and amortization	145	161
Product and Service, Other [Member]
Revenues	283	378
Interest expense	26	11
Depreciation and amortization	$ 282	$ 277