Note 13 - Income Taxes - Deferred Assets and Liabilities (Details) - USD ($)	Jun. 30, 2024	Jun. 30, 2023
Accumulated depreciation	$ 126,000	$ 117,000
Investments in securities at fair value	857,000	1,604,000
Accrued expenses	66,000	218,000
Product start-up costs	103,000	99,000
Share-based compensation expense	162,000	162,000
Other	67,000	40,000
Net operating loss carryover	0	24,000
Capital loss carryover	786,000	0
Subtotal Deferred Tax Assets	2,167,000	2,264,000
Valuation Allowance	0	(24,000)
Total Deferred Tax Assets	2,167,000	2,240,000
Investments in securities at fair value	0	(4,000)
Prepaid expenses	(82,000)	(77,000)
Foreign tax on undistributed earnings	(252,000)	(243,000)
Total Deferred Tax Liabilities	(334,000)	(324,000)
Net Deferred Tax Asset	$ 1,833,000	$ 1,916,000