Condensed Consolidated Balance Sheets (Parentheticals) - $ / shares	Mar. 31, 2017	Jun. 30, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	2,500,000	2,500,000
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	$ 0
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares outstanding (in shares)	20,564,551	20,627,511
Common stock, shares issued (in shares)	22,555,247	21,811,153
Treasury stock, shares at cost (in shares)	1,977,891	1,183,642