Consolidated Balance Sheets (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Allowance for doubtful accounts	$ 409	$ 506
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 (in shares)	40,000,000	40,000,000
Common shares, outstanding (in shares)	25,641,913	24,429,223