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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Net income $ 1,881,000 $ 1,860,000
Depreciation and amortization 1,359,000 811,000
Stock-based compensation 279,000 149,000
Loss on disposition of assets 16,000  
Change in assets and liabilities, net of effects of acquisitions    
Accounts receivable, net (906,000) 2,099,000
Inventories, net (831,000) (514,000)
Prepaid expenses and other (206,000) (321,000)
Accounts payable (35,000) 611,000
Accrued liabilities and taxes payable (659,000) (1,890,000)
Unearned revenues (472,000)  
Net cash provided by operating activities 426,000 2,805,000
Cash flows from investing activities:    
Acquisitions (13,817,000)  
Purchases of property, plant and equipment (393,000) (415,000)
Net cash used in investing activities (14,210,000) (415,000)
Cash flows from financing activities:    
Proceeds from the issuance of debt 18,000,000  
Payments on debt (6,500,000) (2,500,000)
Dividends (526,000) (474,000)
Purchase and retirement of common stock   (15,000)
Proceeds from the exercise of stock options 435,000 182,000
Net cash provided by (used in) financing activities 11,409,000 (2,807,000)
Net decrease in cash and cash equivalents (2,375,000) (417,000)
Cash and cash equivalents at beginning of period 5,575,000 4,006,000
Cash and cash equivalents at end of period 3,200,000 3,589,000
Cash paid for:    
Income taxes 274,000 2,435,000
Interest 92,000 19,000
Supplemental non-cash activity:    
Repayment of employee loans for stock options $ 24,000 $ 92,000