Comprehensive Income (Tables)

6 Months Ended

Sep. 30, 2012

Comprehensive Income [Abstract]

Components of Other Comprehensive Income and Tax Effects [Table Text Block]

			Other
	March 31,		Comprehensive		September 30,
	2012		Income		2012
Accumulated net unrealized holding gain on available-for-sale securities, net of tax	$	3,101	$	2,448	$	5,549
Accumulated net foreign currency translation adjustment	—		1,140		1,140
Total accumulated other comprehensive income	$	3,101	$	3,588	$	6,689