Consolidated Balance Sheets (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Allowance for doubtful accounts	$ 256	$ 273
Preferred shares, par value (in dollars per share)	$ 0	$ 0
Preferred shares, authorized shares (in shares)	1,000,000	1,000,000
Preferred shares, issued (in shares)	0	0
Common shares, par value (in dollars per share)	$ 0	$ 0
Common shares, authorized shares (in shares)	40,000,000	40,000,000
Common shares, outstanding (in shares)	26,517,836	26,286,009