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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net income $ 5,715 $ 3,896
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,849 8,333
Stock-based compensation expense 4,236 3,276
Non-cash interest and debt amortization 443 2,667
Other (224) 321
Cash (used in) provided by changes in operating assets and liabilities:    
Accounts receivable, net 1,065 3,077
Inventories, net (808) (464)
Prepaid expenses and other assets (1,473) (1,941)
Accounts payable (167) (1,604)
Accrued liabilities and taxes payable (4,596) (4,811)
Unearned revenues 983 (140)
Net cash provided by operating activities 14,023 12,610
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,591) (707)
Net cash (used in) investing activities (1,591) (707)
Cash flows from financing activities:    
Proceeds from the issuance of common stock, net 0 145,935
Dividends (1,658) (1,522)
Proceeds from the exercise of stock options 3,081 2,701
Payments of contingent consideration 0 (10)
Net cash provided by financing activities 1,423 147,104
Effect of exchange rate changes on cash and cash equivalents 574 1,537
Net increase in cash and cash equivalents 14,429 160,544
Cash and cash equivalents at beginning of period 263,865 81,380
Cash and cash equivalents at end of period $ 278,294 $ 241,924