Note 10 - Equity Compensation - Stock Options (Details) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Outstanding, shares (in shares)	2,327,148
Outstanding, weighted average exercise price (in dollars per share)	$ 6.07
Outstanding, weighted average remaining contractual term (Year)	5 years 8 months 12 days	6 years 8 months 12 days
Outstanding, aggregate intrinsic value	$ 2,287,764	$ 5,320,456
Granted, shares (in shares)	0
Granted, weighted average exercise price (in dollars per share)	$ 0
Exercised, shares (in shares)	(4,833)
Exercised, weighted average exercise price (in dollars per share)	$ 5.48
Forfeited, shares (in shares)	(7,024)
Forfeited, weighted average exercise price (in dollars per share)	$ 6.80
Expired, shares (in shares)	(14,500)
Expired, weighted average exercise price (in dollars per share)	$ 9.27
Outstanding, shares (in shares)	2,300,791	2,327,148
Outstanding, weighted average exercise price (in dollars per share)	$ 6.05	$ 6.07
Exercisable, shares (in shares)	1,730,964
Exercisable, weighted average exercise price (in dollars per share)	$ 6.31
Exercisable, weighted average remaining contractual term (Year)	5 years 2 months 12 days
Exercisable, aggregate intrinsic value	$ 1,608,413
Vested and expected to vest at June 30, 2022 (in shares)	2,286,311
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 6.05
Vested and expected to vest, weighted average remaining contractual term (Year)	5 years 8 months 12 days
Vested and expected to vest, aggregate intrinsic value	$ 2,282,521