Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Aug. 31, 2008
Cost of Goods and Services Sold	$ 46,433	$ 46,611
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Liability for Uncertainty in Income Taxes, Current	$ 0	0
Accounts Receivable, Allowance for Credit Loss	1	37
Impairment of Intangible Assets, Finite-Lived	0	0
Cost Method Investment, Ownership Percentage			6.00%
Realized Investment Gains (Losses)	(0)	(35)
Unrealized Gain (Loss) on Investments	$ (0)	27
Building and Building Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	15 years
Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years
Air Transportation Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member] | MDC [Member]
Income Tax Examination, Year under Examination	2014
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member] | CII [Member]
Income Tax Examination, Year under Examination	2016
Shipping and Handling [Member]
Cost of Goods and Services Sold	$ 821	$ 1,006