Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
REVENUE:
Revenues from customers	$ 21,360	$ 19,602	$ 41,189	$ 36,786
COSTS AND EXPENSES:
Marketing and advertising	951	1,361	1,865	2,639
General, administrative and other	4,122	3,785	8,134	7,282
Total costs and expenses	16,506	16,004	32,799	32,051
OPERATING INCOME	4,854	3,598	8,390	4,735
OTHER INCOME (EXPENSE):
Interest expense	(538)	(615)	(1,103)	(1,254)
Gain on sale of airplanes	248	3,729	248	4,169
Gain on sale of land	261	0	261	0
Interest income	100	70	206	117
Total other income	71	3,184	(388)	3,032
INCOME BEFORE INCOME TAXES	4,925	6,782	8,002	7,767
PROVISION FOR INCOME TAXES:
Provision for income taxes	1,329	1,831	2,160	2,097
NET INCOME	$ 3,596	$ 4,951	$ 5,842	$ 5,670
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.05	$ 0.07	$ 0.08	$ 0.08
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	68,027,071	69,502,008	68,382,659	72,005,204
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.05	$ 0.07	$ 0.08	$ 0.08
WEIGHTED AVERAGE SHARES USED IN PER SHARE CALCULATION (in shares)	68,027,071	69,502,008	68,382,659	72,005,204
Professional Services [Member]
REVENUE:
Revenues from customers	$ 9,650	$ 9,770	$ 18,887	$ 18,810
COSTS AND EXPENSES:
Cost of services and products	3,909	4,006	7,802	7,952
Aerospace Products [Member]
REVENUE:
Revenues from customers	11,710	9,832	22,302	17,976
COSTS AND EXPENSES:
Cost of services and products	$ 7,524	$ 6,852	$ 14,998	$ 14,178