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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 1,995 $ 1,217
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,572 3,908
Stock-based compensation 2,197 1,268
Non-cash interest and debt amortization 221 1,326
Other (826) 55
Cash provided by changes in operating assets and liabilities:    
Accounts receivable, net 3,285 4,251
Inventories, net (753) (1,194)
Prepaid expenses and other assets (1,631) (1,982)
Accounts payable (476) (913)
Accrued liabilities and taxes payable 867 (4,377)
Unearned revenues 138 (1,299)
Net cash provided by operating activities 9,589 2,260
Cash flows from investing activities:    
Purchases of property, plant and equipment (653) (216)
Net cash (used in) investing activities (653) (216)
Cash flows from financing activities:    
Proceeds from the issuance of common stock, net 0 145,935
Dividends (824) (704)
Proceeds from the exercise of stock options 1,089 1,654
Net cash provided by financing activities 265 146,885
Effect of exchange rate changes on cash and cash equivalents 2,644 642
Net increase in cash and cash equivalents 11,845 149,571
Cash and cash equivalents at beginning of period 263,865 81,380
Cash and cash equivalents at end of period $ 275,710 $ 230,951