Unaudited Condensed Consolidated Balance Sheets (Parentheticals) - $ / shares	Sep. 30, 2017	Mar. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
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)	80,000,000	80,000,000
Common stock, shares issued (in shares)	38,383,751	38,326,329
Common stock, shares outstanding (in shares)	32,764,103	31,912,021
Treasury stock, shares (in shares)	5,619,648	6,414,308