DISAGGREGATION OF REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Disaggregation of Revenue [Line Items]
Total revenues	$ 83,968	$ 78,376
Percentage of completion contracts
Disaggregation of Revenue [Line Items]
Total revenues	26,551	22,570
Goods or services transferred at a point of sale
Disaggregation of Revenue [Line Items]
Total revenues	57,417	55,806
Casino Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenues	27,919	29,441
Sportsbook Revenue
Disaggregation of Revenue [Line Items]
Total revenues	5,789	4,585
Casino Non-Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenues	4,559	4,551
Other Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	0	63
Aircraft Modification
Disaggregation of Revenue [Line Items]
Total revenues	29,587	25,061
Aircraft Avionics
Disaggregation of Revenue [Line Items]
Total revenues	3,377	2,722
Special Mission Electronics
Disaggregation of Revenue [Line Items]
Total revenues	12,737	11,953
Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	38,267	38,640
Professional Services | Percentage of completion contracts
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Professional Services | Goods or services transferred at a point of sale
Disaggregation of Revenue [Line Items]
Total revenues	38,267	38,640
Professional Services | Casino Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenues	27,919	29,441
Professional Services | Sportsbook Revenue
Disaggregation of Revenue [Line Items]
Total revenues	5,789	4,585
Professional Services | Casino Non-Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenues	4,559	4,551
Professional Services | Other Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	0	63
Professional Services | Aircraft Modification
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Professional Services | Aircraft Avionics
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Professional Services | Special Mission Electronics
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenues	45,701	39,736
Aerospace Products | Percentage of completion contracts
Disaggregation of Revenue [Line Items]
Total revenues	26,551	22,570
Aerospace Products | Goods or services transferred at a point of sale
Disaggregation of Revenue [Line Items]
Total revenues	19,150	17,166
Aerospace Products | Casino Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Aerospace Products | Sportsbook Revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Aerospace Products | Casino Non-Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Aerospace Products | Other Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Aerospace Products | Aircraft Modification
Disaggregation of Revenue [Line Items]
Total revenues	29,587	25,061
Aerospace Products | Aircraft Avionics
Disaggregation of Revenue [Line Items]
Total revenues	3,377	2,722
Aerospace Products | Special Mission Electronics
Disaggregation of Revenue [Line Items]
Total revenues	12,737	11,953
North America
Disaggregation of Revenue [Line Items]
Total revenues	65,484	65,069
North America | Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	38,267	38,640
North America | Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenues	27,217	26,429
Europe
Disaggregation of Revenue [Line Items]
Total revenues	14,257	8,161
Europe | Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Europe | Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenues	14,257	8,161
Asia
Disaggregation of Revenue [Line Items]
Total revenues	3,726	2,108
Asia | Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Asia | Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenues	3,726	2,108
Australia and Other
Disaggregation of Revenue [Line Items]
Total revenues	501	3,038
Australia and Other | Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Australia and Other | Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 501	$ 3,038