Note L - Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($)		3 Months Ended
	Apr. 30, 2022	Jun. 30, 2022	Jun. 30, 2021
Balance		$ 79,686,648	$ 65,339,976
Net earnings		11,184,374	11,311,797
Other comprehensive income		7,174,117	(13,693,337)
Paid in capital – restricted stock awards		73,153	121,704
Repurchase of shares		(29,268)
Cash dividends		(157,694)	(137,865)
Net earnings		11,184,374	11,311,797
Balance		102,715,030	62,942,275
Plateplus Inc. [Member]
Shares issued - Plateplus business combination	$ 4,800,000	4,783,700
Common Stock [Member]
Balance		8,344,975	8,334,785
Net earnings			0
Other comprehensive income			0
Repurchase of shares		0
Net earnings			0
Balance		8,861,016	8,334,785
Common Stock [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination		516,041
AOCI Attributable to Parent [Member]
Balance		(10,268,509)
Net earnings			0
Other comprehensive income		7,174,117	(13,693,337)
Repurchase of shares		0
Net earnings			0
Balance		(3,094,392)
AOCI Attributable to Parent [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination		0
Additional Paid-in Capital [Member]
Balance		30,442,361	30,003,462
Net earnings			0
Other comprehensive income			0
Paid in capital – restricted stock awards		73,153	121,704
Repurchase of shares		0
Net earnings			0
Balance		34,783,173	30,125,166
Additional Paid-in Capital [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination		4,267,659
Treasury Stock [Member]
Balance		(7,741,197)	(7,203,342)
Net earnings			0
Other comprehensive income			0
Repurchase of shares		(29,268)
Net earnings			0
Balance		(7,770,465)	(7,203,342)
Treasury Stock [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination		0
Retained Earnings [Member]
Balance		58,909,018	45,392,912
Net earnings		11,184,374	11,311,797
Other comprehensive income			0
Repurchase of shares		0
Cash dividends		(157,694)	(137,865)
Net earnings		11,184,374	11,311,797
Balance		69,935,698	$ 56,566,844
Retained Earnings [Member] | Plateplus Inc. [Member]
Shares issued - Plateplus business combination		$ 0