Consolidated Statements of Cash Flows - Unaudited - USD ($)	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities
NET INCOME	$ 31,547,000	$ 35,630,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,550,000	16,818,000
Loss on write down or disposal of property, capitalized software or investment	554,000	69,000
Stock compensation expense	3,484,000	3,566,000
Provision for doubtful accounts	1,954,000	(1,421,000)
Deferred income tax	(871,000)	(891,000)
Changes in operating assets and liabilities
Accounts receivable	234,000	6,570,000
Customer deposits	(5,380,000)	(684,000)
Prepaid taxes and expenses	(1,443,000)	(1,609,000)
Other assets	361,000	(813,000)
Accounts and taxes payable	566,000	5,391,000
Accrued liabilities	24,001,000	9,625,000
Operating lease liabilities	1,213,000	(5,954,000)
Net cash provided by operating activities	73,770,000	66,297,000
Cash Flows from Investing Activities
Purchase of property and equipment	(13,295,000)	(27,746,000)
Net cash used in investing activities	(13,295,000)	(27,746,000)
Cash Flows from Financing Activities
Purchase of treasury stock	(22,125,000)	(47,512,000)
Exercise of common stock options	6,999,000	6,637,000
Purchases under employee stock purchase	257,000	239,000
Net cash used in financing activities	(14,869,000)	(40,636,000)
Increase in cash and cash equivalents	45,606,000	(2,085,000)
Cash and cash equivalents at beginning of period	83,223,000	91,713,000
Cash and cash equivalents at end of period	128,829,000	89,628,000
Supplemental Cash Flow Information:
Income taxes paid	9,830,000	11,927,000
Purchase of software license under finance agreement	$ 0	$ 3,790,000