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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:      
Net income $ 11,169 $ 9,583 $ 9,000
Depreciation and amortization $ 7,174 5,656 3,844
Loss (gain) on dispositions, net 16 (420)
Deferred income taxes $ (807) 450 (43)
Stock-based compensation 1,327 993 $ 840
Foreign currency adjustments 53 (176)
Change in assets and liabilities, net of effects of acquisitions and dispositions      
Accounts receivable, net (1,958) (2,291) $ 697
Inventories, net (1,202) (3,164) (1,300)
Prepaid expenses and other 391 772 (1,479)
Accounts payable (150) 410 754
Accrued liabilities and taxes payable 2,865 (861) 1,192
Unearned revenues 99 $ (572) 308
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (2,058) (1,020)
Net cash provided by operating activities 16,903 $ 10,816 12,373
Cash flows from investing activities:      
Acquisitions $ (24,111) $ (20,543) (22,758)
Proceeds from disposition 661
Purchases of property, plant and equipment $ (7,729) $ (2,828) (1,041)
Net cash used in investing activities (31,840) (23,371) (23,138)
Cash flow from financing activities:      
Proceeds from the issuance of debt 25,000 23,000 21,000
Payments on debt (6,000) (13,250) (8,500)
Dividends (2,303) (2,182) (1,989)
Proceeds from the exercise of stock options $ 1,923 $ 1,504 1,845
Purchase and retirement of common stock (22)
Net cash provided by financing activities $ 18,620 $ 9,072 $ 12,334
Effect of exchange rate changes on cash and cash equivalents (22) (58)
Net increase (decrease) in cash and cash equivalents 3,661 (3,541) $ 1,569
Cash and cash equivalents at beginning of year 2,034 5,575 4,006
Cash and cash equivalents at end of year 5,695 2,034 5,575
Cash paid during the year for:      
Income taxes 3,951 3,345 4,714
Interest $ 848 499 133
Supplemental non-cash activity:      
Repayment of employee loans for stock options 24 92
Contingent consideration as part of an acquisition $ 9,271 $ 412 $ 500