Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Selected Balance Sheet Data (Details Textual)

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Note 3 - Selected Balance Sheet Data (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2020
Finite-lived Intangible Assets Acquired   $ 8,919  
Patented Technology [Member]      
Finite-lived Intangible Assets Acquired $ 5,000    
Noncash or Part Noncash Acquisition, Intangible Assets Acquired   4,000  
Other Noncurrent Assets [Member]      
Inventory, Finished Goods, Net of Reserves, Non-current   $ 4,972 $ 4,646