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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 3,870 $ 4,288
Depreciation and amortization 4,531 4,411
Stock-based compensation 985 841
Amortization of debt issuance costs 55
Deferred income taxes 144 138
Foreign currency adjustments (533) (28)
Gain on disposition of assets (116)
Adjustment to contingent consideration 300
Change in assets and liabilities, net of effects of acquisitions    
Accounts receivable, net 2,132 1,900
Inventories, net 960 (348)
Prepaid expenses and other (2,241) (509)
Accounts payable (132) 661
Accrued liabilities and taxes payable (1,819) (5,392)
Unearned revenues (312) (39)
Contingent consideration (456) (4,594)
Net cash provided by operating activities 7,368 1,329
Cash flows from investing activities:    
Acquisitions (62) (3,401)
Proceeds from sale of assets 1,133
Purchases of property, plant and equipment (2,012) (6,669)
Net cash used in investing activities (941) (10,070)
Cash flows from financing activities:    
Proceeds from the issuance of debt 4,000 9,500
Payments on debt (7,000) (2,000)
Dividends (1,201) (1,169)
Proceeds from the exercise of stock options 2,064 1,767
Net cash (used in) provided by financing activities (2,137) 8,098
Effect of exchange rate changes on cash and cash equivalents 158 18
Net increase (decrease) in cash and cash equivalents 4,448 (625)
Cash and cash equivalents at beginning of period 5,820 5,695
Cash and cash equivalents at end of period 10,268 5,070
Cash paid for:    
Income taxes 2,446 3,140
Interest 1,007 588
Supplemental non-cash activity:    
Contingent consideration as part of an acquisition $ 1,822