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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended 142 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Cost of Goods and Services Sold, Total $ 46,042 $ 43,755  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   23  
Liability for Uncertainty in Income Taxes, Current $ 0 0 $ 0
Accounts Receivable, Allowance for Credit Loss, Ending Balance 99 84 $ 99
Impairment of Intangible Assets, Finite-lived $ 0 0  
Cost Method Investment, Ownership Percentage 6.00%   6.00%
Asset Impairment Charges, Total     $ 2,562
Unrealized Gain (Loss) on Investments, Total $ 103 (23)  
Realized Investment Gains (Losses), Total 72  
Investment Owned, at Fair Value $ 134 $ 84 $ 134
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    
Transportation Equipment [Member]      
Property, Plant and Equipment, Useful Life (Year) 5 years    
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member]      
Income Tax Examination, Year under Examination   2014 2015 2016 2017  
Shipping and Handling [Member]      
Cost of Goods and Services Sold, Total $ 287 $ 205