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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 1,860 $ 2,099
Depreciation and amortization 811 784
Stock-based compensation 149 149
Change in assets and liabilities, net of acquisitions    
Accounts receivable, net 2,099 (120)
Inventories, net (514) (227)
Prepaid expenses and other (321) 105
Accounts payable 611 412
Accrued liabilities and taxes payable (1,890) 210
Net cash flows provided by operating activities 2,805 3,412
Cash flows from investing activities:    
Acquisitions   (16,660)
Purchases of property, plant and equipment (415) (185)
Net cash used in investing activities (415) (16,845)
Cash flows from financing activities:    
Proceeds from the issuance of debt   11,000
Payments on debt (2,500)  
Dividends (474) (434)
Purchase and retirement of common stock (15) (43)
Proceeds from the exercise of stock options 182 312
Net cash (used in) provided by financing activities (2,807) 10,835
Net decrease in cash and cash equivalents (417) (2,598)
Cash and cash equivalents at beginning of period 4,006 7,191
Cash and cash equivalents at end of period 3,589 4,593
Cash paid for:    
Income taxes 2,435 408
Interest 19  
Supplemental non-cash activity:    
Employee loans issued for the exercise of stock options   155
Repayment of employee loans for stock options 92 289
Contingent consideration as part of an acquisition $ 2,152 $ 2,240