Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from Operating Activities
NET INCOME	$ 17,284,000	$ 13,226,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,119,000	7,944,000
Loss on disposal of assets	23,000	390,000
Stock compensation expense	870,000	387,000
Write-off of uncollectible accounts	385,000	1,142,000
Deferred income tax	(353,000)	(152,000)
Changes in operating assets and liabilities
Accounts receivable	(5,672,000)	(554,000)
Customer deposits	(2,390,000)	(1,495,000)
Prepaid taxes and expenses	2,931,000	4,669,000
Other assets	280,000	52,000
Accounts and taxes payable	1,273,000	(1,590,000)
Accrued liabilities	5,770,000	(160,000)
Net cash provided by operating activities	28,520,000	23,859,000
Cash Flows from Investing Activities
Purchase of property and equipment	(8,987,000)	(6,334,000)
Net cash (used in) investing activities	(8,987,000)	(6,334,000)
Cash Flows from Financing Activities
Purchase of treasury stock	(19,752,000)	(6,937,000)
Tax effect of stock option exercises	729,000	1,845,000
Exercise of common stock options	1,699,000	823,000
Exercise of employee stock purchase options	161,000	161,000
Net cash (used in) financing activities	(17,163,000)	(4,108,000)
Increase (decrease) in cash and cash equivalents	2,370,000	13,417,000
Cash and cash equivalents at beginning of period	19,822,000	6,597,000
Cash and cash equivalents at end of period	22,192,000	20,014,000
Supplemental Cash Flow Information:
Income taxes paid	7,588,000	3,010,000
Purchase of software license under finance agreement	$ 2,343,000