Note 12 - Stock Options - Summary of Intrinsic Value and Cash Received From Stock Option Exercises and Fair Value of Vested Stock Options (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Total intrinsic value of stock options exercised		$ 34,797
Cash received from stock option exercises		46,677	[1]
Total fair value of stock options vested	483,461	374,639
Total recognized tax benefit		$ 9,198

[1] As adjusted for change in accounting policy (Note 3)