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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:      
Net income $ 8,450 $ 7,919 $ 6,183
Depreciation and amortization 3,432 2,215 1,844
Deferred income taxes (291) (258) (414)
Stock-based compensation 1,112 464 383
Impairment of intangible asset   350  
Change in assets and liabilities, net of acquisitions      
Accounts receivable, net (1,510) 493 (931)
Inventories, net (228) 1,276 (72)
Prepaid expenses and other (189) 38 180
Accounts payable 437 (150) (1)
Accrued liabilities and taxes payable 189 142 1,696
Net cash provided by operating activities 11,402 12,489 8,868
Cash flows from investing activities:      
Acquisitions (16,660) (737) (17,973)
Purchases of property, plant and equipment (908) (683) (2,645)
Net cash used in investing activities (17,568) (1,420) (20,618)
Cash flow from financing activities:      
Proceeds from the issuance of debt 11,000   7,000
Payments on debt (7,000) (6,500) (778)
Dividends (1,815) (1,645) (1,488)
Proceeds from the exercise of stock options 894 813 196
Purchase and retirement of common stock (98) (92) (105)
Net cash provided by (used in) financing activities 2,981 (7,424) 4,825
Net (decrease) increase in cash and cash equivalents (3,185) 3,645 (6,925)
Cash and cash equivalents at beginning of year 7,191 3,546 10,471
Cash and cash equivalents at end of year 4,006 7,191 3,546
Cash paid during the year for:      
Income taxes 4,778 4,457 3,528
Cash paid for interest 116 176 141
Supplemental non-cash activity:      
Employee loans issued for exercise of stock options 203 396 437
Repayment of employee loans for stock options 450 437  
Contingent consideration as part of an acquisition $ 2,140