Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from Operating Activities
NET INCOME	$ 19,150,000	$ 21,479,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,854,000	10,613,000
Loss on disposal of assets	406,000	158,000
Stock compensation expense	650,000	1,870,000
Write-off of uncollectible accounts	1,737,000	1,602,000
Deferred income tax	(256,000)	(673,000)
Changes in operating assets and liabilities
Accounts receivable	4,220,000	1,243,000
Customer deposits	(2,353,000)	608,000
Prepaid taxes and expenses	4,448,000	(385,000)
Other assets	216,000	(272,000)
Accounts and taxes payable	1,012,000	(330,000)
Accrued liabilities	2,506,000	(7,888,000)
Net cash provided by operating activities	43,590,000	28,025,000
Cash Flows from Investing Activities
Acquisition, net of cash		(45,000)
Purchase of property and equipment	(9,206,000)	(16,715,000)
Net cash (used in) investing activities	(9,206,000)	(16,760,000)
Cash Flows from Financing Activities
Purchase of treasury stock	(23,676,000)	(16,264,000)
Tax effect of stock option exercises	1,035,000	1,009,000
Exercise of common stock options	2,268,000	1,629,000
Exercise of employee stock purchase options	161,000	157,000
Net cash (used in) financing activities	(20,212,000)	(13,469,000)
Increase (decrease) in cash and cash equivalents	14,172,000	(2,204,000)
Cash and cash equivalents at beginning of period	6,597,000	12,269,000
Cash and cash equivalents at end of period	20,769,000	10,065,000
Supplemental Cash Flow Information:
Income taxes paid	6,759,000	12,707,000
Accrual of legal settlement		2,800,000
Purchase of software license under finance agreement		$ 861,000