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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
12 Months Ended 130 Months Ended
Jun. 01, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2017
Cost of Goods and Services Sold, Total   $ 43,755,000 $ 38,722,000    
Advertising Expense   $ 6,000 17,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years      
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 23,000      
Liability for Uncertainty in Income Taxes, Current   0   $ 0 $ 0
Accounts Receivable, Allowance for Credit Loss, Ending Balance   84,000 134,000 84,000  
Impairment of Intangible Assets, Finite-lived   0 0    
Unrealized Gain (Loss) on Investments, Total   (23,000)    
Payments to Acquire Equity Method Investments   8,000 1,000    
AgroSport LLC [Member]          
Equity Method Investment, Ownership Percentage 33.33%        
Payments to Acquire Equity Method Investments $ 10,000        
Equity Method Investments   $ 0 89,000 $ 0  
IBio Inc [Member]          
Cost Method Investment, Ownership Percentage   6.00%   6.00%  
Asset Impairment Charges, Total       $ 2,562,000  
Unrealized Gain (Loss) on Investments, Total       (23,000)  
Investment Owned, at Fair Value   $ 84,000 107,000 $ 84,000  
Building Improvements [Member]          
Property, Plant and Equipment, Useful Life   15 years      
Machinery and Equipment [Member]          
Property, Plant and Equipment, Useful Life   7 years      
Transportation Equipment [Member]          
Property, Plant and Equipment, Useful Life   5 years      
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member]          
Income Tax Examination, Year under Examination   2014 2015 2016 2017      
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member] | Earliest Tax Year [Member]          
Income Tax Examination, Year under Examination   2014      
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member] | Latest Tax Year [Member]          
Income Tax Examination, Year under Examination   2017      
Shipping and Handling [Member]          
Cost of Goods and Services Sold, Total   $ 205,000 $ 207,000