Consolidated Statements of Cash Flows - Unaudited - USD ($)	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flows from Operating Activities
NET INCOME	$ 21,492,000	$ 21,859,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,617,000	14,908,000
Loss on disposal of assets	424,000	21,000
Stock compensation expense	1,736,000	1,602,000
Write-off of uncollectible accounts	1,684,000	1,096,000
Deferred income tax	(660,000)	(591,000)
Changes in operating assets and liabilities
Accounts receivable	(1,118,000)	564,000
Customer deposits	(4,980,000)	(6,603,000)
Prepaid taxes and expenses	(2,000,000)	4,979,000
Other assets	(137,000)	(711,000)
Accounts and taxes payable	(722,000)	(4,157,000)
Accrued liabilities	4,293,000	3,845,000
Net cash provided by operating activities	35,629,000	36,812,000
Cash Flows from Investing Activities
Investment in private equity	(250,000)	(600,000)
Purchase of property and equipment	(17,173,000)	(11,901,000)
Net cash (used in) investing activities	(17,423,000)	(12,501,000)
Cash Flows from Financing Activities
Purchase of treasury stock	(15,125,000)	(26,778,000)
Tax effect of stock option exercises	880,000	733,000
Exercise of common stock options	1,868,000	2,541,000
Exercise of employee stock purchase options	201,000	181,000
Net cash (used in) financing activities	(12,176,000)	(23,323,000)
(Decrease) Increase in cash and cash equivalents	6,030,000	988,000
Cash and cash equivalents at beginning of period	32,779,000	25,516,000
Cash and cash equivalents at end of period	38,809,000	26,504,000
Supplemental Cash Flow Information:
Income taxes paid	13,929,000	17,188,000
Purchase of software license under finance agreement	$ 3,492,000	$ 0