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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 3,792 $ 4,348
Depreciation and amortization 1,639 1,675
Gain on dispositions (468)  
Stock-based compensation 357 438
Change in assets and liabilities, net of effects of acquisitions and dispositions    
Accounts receivable, net 1,383 (452)
Inventories, net (475) (282)
Prepaid expenses and other (598) 134
Accounts payable 334 103
Accrued liabilities and taxes payable (385) (1,038)
Net cash flows provided by operating activities 5,579 4,926
Cash flows from investing activities:    
Acquisitions (1,721) (16,660)
Proceeds from dispositions 661  
Purchases of property, plant and equipment (771) (370)
Net cash used in investing activities (1,831) (17,030)
Cash flows from financing activities:    
Proceeds from the issuance of debt   11,000
Payments on debt (4,000) (3,000)
Dividends (952) (871)
Purchase and retirement of common stock (15) (57)
Proceeds from the exercise of stock options 637 613
Net cash (used in) provided by financing activities (4,330) 7,685
Net decrease in cash and cash equivalents (582) (4,419)
Cash and cash equivalents at beginning of period 4,006 7,191
Cash and cash equivalents at end of period 3,424 2,772
Cash paid for:    
Income taxes 3,190 2,814
Interest   75
Supplemental non-cash activity:    
Employee loans issued for the exercise of stock options   166
Repayment of employee loans for stock options 92 347
Contingent consideration as part of an acquisition $ 2,164 $ 2,140