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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 1,930,000 $ 2,755,000
Depreciation and amortization 2,170,000 1,504,000
Stock-based compensation 429,000 327,000
Deferred income taxes 138,000 191,000
Foreign currency adjustments 67,000 21,000
Change in assets and liabilities, net of effects of acquisitions    
Accounts receivable, net 2,890,000 966,000
Inventories, net (67,000) (451,000)
Prepaid expenses and other (426,000) (384,000)
Accounts payable (66,000) (178,000)
Accrued liabilities and taxes payable (3,584,000) (671,000)
Unearned revenues 40,000 (99,000)
Contingent consideration 111,000 (1,120,000)
Net cash provided by operating activities 3,632,000 2,861,000
Cash flows from investing activities:    
Acquisitions (2,565,000)
Purchases of property, plant and equipment (3,456,000) (1,675,000)
Net cash used in investing activities (6,021,000) (1,675,000)
Cash flows from financing activities:    
Proceeds from the issuance of debt 1,500,000
Payments on debt (750,000) (1,250,000)
Dividends (583,000) (569,000)
Proceeds from the exercise of stock options 1,160,000 560,000
Net cash provided by (used in) financing activities 1,327,000 (1,259,000)
Effect of exchange rate changes on cash and cash equivalents 4,000 7,000
Net decrease in cash and cash equivalents (1,058,000) (66,000)
Cash and cash equivalents at beginning of period 5,695,000 2,034,000
Cash and cash equivalents at end of period 4,637,000 1,968,000
Cash paid for:    
Income taxes 1,207,000 344,000
Interest 292,000 129,000
Supplemental non-cash activity:    
Contingent consideration as part of an acquisition $ 1,168,000