Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Accounts receivable, allowance for doubtful accounts	$ 14	$ 18
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)	7,429,020	6,937,018
Common stock, outstanding (in shares)	7,429,020	6,937,018
Treasury stock, shares (in shares)	1,052,657	1,044,659