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Note 3 - Revenue Recognition - Revenues by Geographic Location (Details) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Total net revenue $ 15,147,034 $ 3,175,236 $ 28,667,280 $ 4,615,062
UNITED STATES        
Total net revenue 13,757,000 3,047,000 25,901,000 4,309,000
Non-US [Member]        
Total net revenue $ 1,390,000 $ 128,000 $ 2,766,000 $ 306,000