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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Net income $ 4,941,000 $ 3,792,000
Depreciation and amortization 2,721,000 1,639,000
Stock-based compensation 516,000 357,000
Loss (gain) on disposition of assets 16,000 (468,000)
Change in assets and liabilities, net of effects of acquisitions    
Accounts receivable, net (1,952,000) 1,383,000
Inventories, net (1,515,000) (475,000)
Prepaid expenses and other (682,000) (598,000)
Accounts payable 632,000 334,000
Accrued liabilities and taxes payable (307,000) (385,000)
Unearned revenues (626,000)  
Net cash provided by operating activities 3,744,000 5,579,000
Cash flows from investing activities:    
Acquisitions (13,817,000) (1,721,000)
Proceeds from dispositions   661,000
Purchases of property, plant and equipment (908,000) (771,000)
Net cash used in investing activities (14,725,000) (1,831,000)
Cash flows from financing activities:    
Proceeds from the issuance of debt 18,000,000  
Payments on debt (8,750,000) (4,000,000)
Dividends (1,052,000) (952,000)
Purchase and retirement of common stock   (15,000)
Proceeds from the exercise of stock options 865,000 637,000
Net cash provided by (used in) financing activities 9,063,000 (4,330,000)
Net decrease in cash and cash equivalents (1,918,000) (582,000)
Cash and cash equivalents at beginning of period 5,575,000 4,006,000
Cash and cash equivalents at end of period 3,657,000 3,424,000
Cash paid for:    
Income taxes 1,492,000 3,190,000
Interest 210,000  
Supplemental non-cash activity:    
Repayment of employee loans for stock options $ 24,000 $ 92,000