Disaggregation of Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 23,251	$ 21,360	$ 43,376	$ 41,189
Percentage of completion contracts
Disaggregation of Revenue [Line Items]
Total revenue	6,792	6,539	11,872	12,619
Goods or services transferred at a point of sale
Disaggregation of Revenue [Line Items]
Total revenue	16,459	14,821	31,504	28,570
Casino Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenue	6,833	7,016	13,316	14,098
Sports Wagering Revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,558	1,436	2,845	2,443
Casino Non-Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenue	821	1,198	1,862	2,346
Aircraft Modification
Disaggregation of Revenue [Line Items]
Total revenue	8,414	7,170	14,056	14,276
Aircraft Avionics
Disaggregation of Revenue [Line Items]
Total revenue	852	824	2,289	1,285
Special Mission Electronics
Disaggregation of Revenue [Line Items]
Total revenue	4,773	3,716	9,008	6,741
Professional Services
Disaggregation of Revenue [Line Items]
Total revenue	9,212	9,650	18,023	18,887
Professional Services | Percentage of completion contracts
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Professional Services | Goods or services transferred at a point of sale
Disaggregation of Revenue [Line Items]
Total revenue	9,212	9,650	18,023	18,887
Professional Services | Casino Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenue	6,833	7,016	13,316	14,098
Professional Services | Sports Wagering Revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,558	1,436	2,845	2,443
Professional Services | Casino Non-Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenue	821	1,198	1,862	2,346
Professional Services | Aircraft Modification
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Professional Services | Aircraft Avionics
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Professional Services | Special Mission Electronics
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenue	14,039	11,710	25,353	22,302
Aerospace Products | Percentage of completion contracts
Disaggregation of Revenue [Line Items]
Total revenue	6,792	6,539	11,872	12,619
Aerospace Products | Goods or services transferred at a point of sale
Disaggregation of Revenue [Line Items]
Total revenue	7,247	5,171	13,481	9,683
Aerospace Products | Casino Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Aerospace Products | Sports Wagering Revenue
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Aerospace Products | Casino Non-Gaming Revenue
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Aerospace Products | Aircraft Modification
Disaggregation of Revenue [Line Items]
Total revenue	8,414	7,170	14,056	14,276
Aerospace Products | Aircraft Avionics
Disaggregation of Revenue [Line Items]
Total revenue	852	824	2,289	1,285
Aerospace Products | Special Mission Electronics
Disaggregation of Revenue [Line Items]
Total revenue	4,773	3,716	9,008	6,741
North America
Disaggregation of Revenue [Line Items]
Total revenue	21,246	17,709	38,290	33,313
North America | Professional Services
Disaggregation of Revenue [Line Items]
Total revenue	9,212	9,650	18,023	18,887
North America | Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenue	12,034	8,059	20,267	14,426
Europe
Disaggregation of Revenue [Line Items]
Total revenue	984	3,108	2,240	6,643
Europe | Professional Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Europe | Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenue	984	3,108	2,240	6,643
Asia
Disaggregation of Revenue [Line Items]
Total revenue	984	473	2,726	928
Asia | Professional Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Asia | Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenue	984	473	2,726	928
Australia and Other
Disaggregation of Revenue [Line Items]
Total revenue	37	70	120	305
Australia and Other | Professional Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Australia and Other | Aerospace Products
Disaggregation of Revenue [Line Items]
Total revenue	$ 37	$ 70	$ 120	$ 305