Unaudited Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Accounts receivable, allowance for doubtful accounts	$ 2,186	$ 2,768
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, authorized (in shares)	80,000,000	80,000,000
Common stock, issued (in shares)	38,168,708	38,116,884
Common stock, outstanding (in shares)	31,455,311	31,674,782
Treasury stock, shares (in shares)	6,713,397	6,442,102