Note 13 - Stock-based Compensation - Summary of Stock Options (Details)	3 Months Ended	9 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) $ / shares shares
Outstanding (in shares)	501,000	501,000
The 2010 Plan [Member]
Outstanding (in shares)		100,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares		$ 14.50
Granted (in shares)		0
Granted, weighted average exercise price (in dollars per share) | $ / shares
Exercised (in shares)	0	0
Exercised, weighted average exercise price (in dollars per share) | $ / shares
Forfeited (in shares)		0
Forfeited, weighted average exercise price (in dollars per share) | $ / shares
Outstanding (in shares)	100,000	100,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 14.50	$ 14.50
Aggregate intrinsic value, outstanding | $	$ 1,032,000	$ 1,032,000
Exercisable, end of the period (in shares)	100,000	100,000
Exercisable, end of year, weighted average exercise price (in dollars per share) | $ / shares
Aggregate intrinsic value, exercisable | $	$ 1,032,000	$ 1,032,000
Available for grant, end of period (in shares)	473,386	473,386
Weighted average fair value per share of options granted during the period (in dollars per share) | $ / shares		$ 0