Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Accounts receivable, allowance for doubtful accounts	$ 18	$ 45
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	500,000	500,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, issued (in shares)	6,937,018	6,868,628
Common stock, outstanding (in shares)	6,937,018	6,868,628
Treasury stock, shares (in shares)	1,044,659	958,049