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Consolidated Statements of Cash Flows - Unaudited - USD ($)
 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash Flows from Operating Activities    
NET INCOME $ 24,567,000 $ 17,168,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,275,000 10,540,000
(Gain) loss on write down or disposal of property, capitalized software or investment (37,000) 450,000
Stock compensation expense 2,087,000 1,529,000
Provision for doubtful accounts 1,503,000 887,000
Deferred income tax (521,000) (559,000)
Changes in operating assets and liabilities    
Accounts receivable (1,628,000) (4,042,000)
Customer deposits (5,837,000) (6,567,000)
Prepaid taxes and expenses (502,000) (190,000)
Other assets 125,000 (274,000)
Accounts and taxes payable 248,000 (1,140,000)
Accrued liabilities 17,320,000 12,795,000
Net cash provided by operating activities 48,600,000 30,597,000
Cash Flows from Investing Activities    
Purchase of property and equipment (6,473,000) (11,428,000)
Net cash (used in) investing activities (6,473,000) (11,428,000)
Cash Flows from Financing Activities    
Purchase of treasury stock (11,302,000) (11,187,000)
Exercise of common stock options 3,285,000 1,308,000
Exercise of employee stock purchase options 252,000 232,000
Net cash (used in) financing activities (7,765,000) (9,647,000)
Increase in cash and cash equivalents 34,362,000 9,522,000
Cash and cash equivalents at beginning of period 55,771,000 28,611,000
Cash and cash equivalents at end of period 90,133,000 38,133,000
Supplemental Cash Flow Information:    
Income taxes paid $ 5,585,000 $ 5,197,000