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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Acquisitions $ (62) $ (2,565)
Purchases of property, plant and equipment (1,505) (3,456)
Net cash used in investing activities (1,567) (6,021)
Cash flows from operating activities:    
Net income 1,517 1,930
Depreciation and amortization 2,278 2,170
Stock-based compensation 540 429
Amortization of debt issuance costs 28
Deferred income taxes 90 138
Foreign currency adjustments (176) 67
Adjustment to contingent consideration 300
Change in assets and liabilities, net of effects of acquisitions    
Accounts receivable, net 1,416 2,890
Inventories, net 497 (67)
Prepaid expenses and other (1,711) (426)
Accounts payable 170 (66)
Accrued liabilities and taxes payable (1,747) (3,584)
Unearned revenues (84) 40
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (437) 111
Net cash provided by operating activities 2,681 3,632
Cash flows from investing activities:    
Proceeds from the issuance of debt 1,500
Payments on debt (4,250) (750)
Dividends (601) (583)
Proceeds from the exercise of stock options 963 1,160
Net cash (used in) provided by financing activities (3,888) 1,327
Effect of exchange rate changes on cash and cash equivalents (70) 4
Net decrease in cash and cash equivalents (2,844) (1,058)
Cash and cash equivalents at beginning of period 5,820 5,695
Cash and cash equivalents at end of period 2,976 4,637
Cash paid for:    
Income taxes 658 1,207
Interest 561 292
Supplemental non-cash activity:    
Contingent consideration as part of an acquisition $ 1,168