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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:      
Net income $ 11,183 $ 11,169 $ 9,583
Depreciation and amortization 8,737 7,174 5,656
Gain on dispositions, net 16
Deferred income taxes (630) (807) 450
Stock-based compensation 1,411 1,327 993
Foreign currency adjustments 93 53 (176)
Change in assets and liabilities, net of effects of acquisitions and dispositions      
Accounts receivable, net 994 (1,958) (2,291)
Inventories, net 295 (1,202) (3,164)
Prepaid expenses and other (830) 391 772
Accounts payable (655) (150) 410
Accrued liabilities and taxes payable (3,066) 2,865 (861)
Unearned revenues (228) 99 (572)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (9,554) (2,058)
Net cash provided by operating activities 7,750 16,903 10,816
Cash flows from investing activities:      
Acquisitions (6,800) (24,111) (20,543)
Purchases of property, plant and equipment (11,605) (7,729) (2,828)
Net cash used in investing activities (18,405) (31,840) (23,371)
Cash flow from financing activities:      
Proceeds from the issuance of debt 66,550 25,000 23,000
Payments on debt (57,000) (6,000) (13,250)
Dividends (2,355) (2,303) (2,182)
Proceeds from the exercise of stock options 3,513 1,923 1,504
Net cash provided by financing activities 10,708 18,620 9,072
Effect of exchange rate changes on cash and cash equivalents 72 (22) (58)
Net increase (decrease) in cash and cash equivalents 125 3,661 (3,541)
Cash and cash equivalents at beginning of year 5,695 2,034 5,575
Cash and cash equivalents at end of year 5,820 5,695 2,034
Cash paid during the year for:      
Income taxes 5,605 3,951 3,345
Interest 1,384 848 499
Supplemental non-cash activity:      
Repayment of employee loans for stock options 24
Contingent consideration as part of an acquisition $ 1,822 $ 9,271 $ 412