Note 19 - Stock Options - Summary of Options Activities 2007 Employee Plan (Details) - Employee Stock Option Plan 2007 [Member] - USD ($)	1 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Outstanding. options (in shares)		37,500	77,500	77,500
Outstanding, weighted average exercise price (in dollars per share)		$ 4.14	$ 3.69	$ 3.69
Outstanding, weighted average remaining contractual term (Year)			11 months 26 days	9 months	1 year 2 months 19 days
Aggregate intrinsic value outstanding, ending	$ 13.13		$ 13.13	$ 34
Exercised, options (in shares)	0	(37,500)	(40,000)
Exercised, weighted average exercise price (in dollars per share)		$ 4.14	$ 3.26
Outstanding, options (in shares)	37,500		37,500	37,500	77,500
Outstanding, weighted average exercise price (in dollars per share)	$ 4.14		$ 4.14	$ 4.14	$ 3.69
Exercisable, options (in shares)	37,500		37,500
Exercisable, weighted average exercise price (in dollars per share)	$ 4.14		$ 4.14
Exercisable, weighted average remaining contractual term (Year)			11 months 26 days
Exercisable at March 31, 2021	$ 13.13		$ 13.13