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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:    
Net income $ 7,540,000 $ 7,178,000
Depreciation and amortization 6,609,000 5,207,000
Stock-based compensation 1,221,000 1,001,000
Deferred income taxes 418,000 128,000
Foreign currency adjustments (17,000) 85,000
Change in assets and liabilities, net of effects of acquisitions    
Accounts receivable, net 2,369,000 72,000
Inventories, net (410,000) (1,901,000)
Prepaid expenses and other (1,094,000) 40,000
Accounts payable 96,000 80,000
Accrued liabilities and taxes payable (4,401,000) (49,000)
Unearned revenues (484,000) (118,000)
Contingent consideration (5,076,000) (1,770,000)
Net cash provided by operating activities 6,771,000 9,953,000
Cash flows from investing activities:    
Acquisitions (6,618,000) (23,199,000)
Purchases of property, plant and equipment (9,367,000) (6,291,000)
Net cash used in investing activities (15,985,000) (29,490,000)
Cash flows from financing activities:    
Proceeds from the issuance of debt 11,500,000 25,000,000
Payments on debt (3,750,000) (4,250,000)
Dividends (1,760,000) (1,724,000)
Proceeds from the exercise of stock options 2,815,000 1,800,000
Net cash provided by financing activities 8,805,000 20,826,000
Effect of exchange rate changes on cash and cash equivalents 119,000 (51,000)
Net (decrease) increase in cash and cash equivalents (290,000) 1,238,000
Cash and cash equivalents at beginning of period 5,695,000 2,034,000
Cash and cash equivalents at end of period 5,405,000 3,272,000
Cash paid for:    
Income taxes 4,188,000 3,375,000
Interest 913,000 563,000
Supplemental non-cash activity:    
Contingent consideration as part of an acquisition $ 1,822,000 $ 9,541,000