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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income $ 4,058,000 $ 4,941,000
Depreciation and amortization 3,439,000 2,721,000
Stock-based compensation 657,000 516,000
Loss on disposition of assets   16,000
Deferred income taxes (113,000)  
Foreign currency adjustments 647,000  
Change in assets and liabilities, net of effects of acquisitions    
Accounts receivable, net 668,000 (1,952,000)
Inventories, net (548,000) (1,515,000)
Prepaid expenses and other (609,000) (682,000)
Accounts payable 65,000 632,000
Accrued liabilities and taxes payable 2,785,000 (307,000)
Unearned revenues 114,000 (626,000)
Contingent consideration (2,201,000)  
Net cash provided by operating activities 8,962,000 3,744,000
Cash flows from investing activities:    
Acquisitions (30,228,000) (13,817,000)
Purchases of property, plant and equipment (5,035,000) (908,000)
Net cash used in investing activities (25,722,000) (14,725,000)
Cash flows from financing activities:    
Proceeds from the issuance of debt 22,500,000 18,000,000
Payments on debt (2,000,000) (8,750,000)
Dividends (1,144,000) (1,052,000)
Proceeds from the exercise of stock options 846,000 865,000
Net cash provided by financing activities 20,202,000 9,063,000
Effect of exchange rate changes on cash and cash equivalents (16,000)  
Net increase (decrease) in cash and cash equivalents 3,426,000 (1,918,000)
Cash and cash equivalents at beginning of period 2,034,000 5,575,000
Cash and cash equivalents at end of period 5,460,000 3,657,000
Cash paid for:    
Income taxes 2,862,000 1,492,000
Interest 315,000 210,000
Supplemental non-cash activity:    
Repayment of employee loans for stock options   $ 24,000
Contingent consideration as part of an acquisition $ 9,541,000