Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
REVENUE:
Revenues from customers	$ 17,185	$ 15,304
COSTS AND EXPENSES:
Marketing and advertising	1,278	1,331
General, administrative and other	3,498	3,898
Total costs and expenses	16,048	13,679
OPERATING INCOME	1,137	1,625
OTHER INCOME (EXPENSE):
Interest expense	(639)	(723)
Gain on sale of airplanes	440	0
Gain on sale of building	0	69
Interest income	47	0
Total other expense	(152)	(654)
INCOME BEFORE INCOME TAXES	985	971
PROVISION FOR INCOME TAXES:
Provision for income taxes	266	260
Deferred Income Tax Expense (Benefit)	0	280
NET INCOME	$ 719	$ 431
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.01	$ 0.01
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	75,198,532	76,456,284
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.01	$ 0.01
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	75,198,532	76,456,284
Professional Services [Member]
REVENUE:
Revenues from customers	$ 9,041	$ 8,962
COSTS AND EXPENSES:
Cost of services and products	3,946	3,623
Aerospace Products [Member]
REVENUE:
Revenues from customers	8,144	6,342
COSTS AND EXPENSES:
Cost of services and products	$ 7,326	$ 4,827