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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 2,306 $ 1,881
Depreciation and amortization 1,504 1,359
Stock-based compensation 327 279
Loss on disposition of assets   16
Deferred income taxes 191  
Foreign currency adjustments 21  
Change in assets and liabilities, net of effects of acquisitions    
Accounts receivable, net 966 (906)
Inventories, net (451) (831)
Prepaid expenses and other (384) (206)
Accounts payable (178) (35)
Accrued liabilities and taxes payable (222) (659)
Unearned revenues (99) (472)
Contingent consideration (1,120)  
Net cash provided by operating activities 2,861 426
Cash flows from investing activities:    
Acquisitions   (13,817)
Purchases of property, plant and equipment (1,675) (393)
Net cash used in investing activities (1,675) (14,210)
Cash flows from financing activities:    
Proceeds from the issuance of debt   18,000
Payments on debt (1,250) (6,500)
Dividends (569) (526)
Proceeds from the exercise of stock options 560 435
Net cash (used in) provided by financing activities (1,259) 11,409
Effect of exchange rate changes on cash and cash equivalents 7  
Net decrease in cash and cash equivalents (66) (2,375)
Cash and cash equivalents at beginning of period 2,034 5,575
Cash and cash equivalents at end of period 1,968 3,200
Cash paid for:    
Income taxes 344 274
Interest $ 129 92
Supplemental non-cash activity:    
Repayment of employee loans for stock options   $ 24