Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from Operating Activities
NET INCOME	$ 8,609,000	$ 6,596,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,012,000	4,359,000
Loss on disposal of assets	1,000	8,000
Stock compensation expense	405,000	297,000
Write-off of uncollectible accounts	320,000	438,000
Deferred income tax	(162,000)	(120,000)
Changes in operating assets and liabilities
Accounts receivable	(1,973,000)	2,565,000
Customer deposits	(1,220,000)	(986,000)
Prepaid taxes and expenses	2,879,000	3,244,000
Other assets	174,000	137,000
Accounts and taxes payable	3,580,000	(1,725,000)
Accrued liabilities	168,000	(1,347,000)
Net cash provided by operating activities	16,793,000	13,466,000
Cash Flows from Investing Activities
Purchase of property and equipment	(5,477,000)	(3,404,000)
Net cash (used in) investing activities	(5,477,000)	(3,404,000)
Cash Flows from Financing Activities
Purchase of treasury stock	(7,308,000)	(3,673,000)
Tax effect of stock option exercises	337,000	489,000
Exercise of common stock options	867,000	1,093,000
Net cash (used in) financing activities	(6,104,000)	(2,091,000)
Increase (decrease) in cash and cash equivalents	5,212,000	7,971,000
Cash and cash equivalents at beginning of period	19,822,000	6,597,000
Cash and cash equivalents at end of period	25,034,000	14,568,000
Supplemental Cash Flow Information:
Income taxes paid	300,000	110,000
Purchase of software license under finance agreement	$ 2,343,000