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Note 11 - 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, 2019
Jun. 30, 2018
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 374,639 399,595
Total recognized tax benefit $ 9,198
[1] As adjusted for the retrospective adoption of ASC 606