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Note 4 - Inventories (Details) - USD ($)
Jun. 30, 2019
Jun. 30, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 2,118,000 $ 807,000
Work in process 645,000 333,000
Finished goods 1,050,000 372,000
Total inventories $ 3,813,000 $ 1,512,000