Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended				24 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2023	Aug. 31, 2008
Cost of Goods and Services Sold	$ 46,611	$ 49,694
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Liability for Uncertainty in Income Taxes, Current			$ 0
Accounts Receivable, Allowance for Credit Loss	37	$ 85			$ 37
Impairment of Intangible Assets, Finite-Lived			$ 0
Cost Method Investment, Ownership Percentage						6.00%
Asset Impairment Charges, Total		2,562
Realized Investment Gains (Losses)	(35)	0
Unrealized Gain (Loss) on Investments	$ 27	(55)
Investment Owned, at Fair Value		$ 12
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		2016 2017 2018 2019
Shipping and Handling [Member]
Cost of Goods and Services Sold		$ 349			$ 1,006