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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Aug. 31, 2008
Cost of Goods and Services Sold, Total $ 49,694 $ 54,079    
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, Ending Balance $ 85 124    
Impairment of Intangible Assets, Finite-Lived   0    
Cost Method Investment, Ownership Percentage       6.00%
Asset Impairment Charges, Total 2,562      
Realized Investment Gains (Losses), Total 0 56    
Unrealized Gain (Loss) on Investments (55) (53)    
Investment Owned, at Fair Value $ 12 67    
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, Total $ 648 $ 349