Note 3 - Revenue Recognition - Revenues by Geographic Location (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Total net revenue	$ 13,482,282	$ 8,156,173	$ 42,149,561	$ 12,771,235
UNITED STATES
Total net revenue	12,344,000	7,273,000	38,245,000	11,582,000
Non-US [Member]
Total net revenue	$ 1,138,000	$ 883,000	$ 3,905,000	$ 1,189,000