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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 7,659 $ 5,224
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,444 4,889
Stock-based compensation 2,050 1,729
Gain on disposition of assets (288)
Non-cash interest and other 706
Change in inventory reserve 70 67
Adjustment to contingent consideration (54) (33)
Other 183 44
Cash used by changes in operating assets and liabilities    
Accounts receivable, net 246 643
Inventories, net 295 1,022
Prepaid expenses and other (2,508) (1,301)
Accounts payable (571) (70)
Accrued liabilities and taxes payable (5,385) (866)
Unearned revenues 14 (177)
Contingent Consideration (11) (683)
Net cash provided by operating activities 7,138 10,200
Cash flows from investing activities:    
Acquisitions (2,555)
Purchases of property, plant and equipment (543) (849)
Proceeds from sale of assets 2,222
Net cash (used in) provided by investing activities (3,098) 1,373
Cash flows from financing activities:    
Proceeds from the issuance of convertible senior notes, net 167,070
Proceeds from the issuance of common stock, net 84,995
Payments on debt (23,000) (13,250)
Dividends (1,321) (1,226)
Proceeds from the exercise of stock options 3,507 3,176
Net cash provided by (used in) financing activities 231,251 (11,300)
Effect of exchange rate changes on cash and cash equivalents (33) (117)
Net increase in cash and cash equivalents 235,258 156
Cash and cash equivalents at beginning of period 10,185 5,469
Cash and cash equivalents at end of period 245,443 5,625
Cash paid for:    
Income taxes 1,797 5,310
Interest 388 938
Supplemental non-cash activity:    
Deferred tax liability related to the conversion option associated with the convertible senior notes $ 8,448