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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
6 Months Ended
Sep. 30, 2011
Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:  
Net income$ 760,872$ 844,730
Adjustments to reconcile net income to net cash used in operating activities:  
Loss on disposal of equipment875 
Change in accounts receivable and inventory reserves35,76025,386
Depreciation and amortization116,711187,583
Change in cash surrender value of life insurance(34,002)(34,002)
Deferred income taxes (163,000)
Warranty reserve200,24532,308
Compensation expense related to stock options1,4691,600
Change in operating assets and liabilities:  
Accounts receivable(519,568)(3,695,935)
Notes receivable and other non-trade receivables128,340197,002
Inventories(1,204,781)(3,617,087)
Prepaid expenses and other(113,093)(41,188)
Accounts payable460,8392,005,506
Accrued expenses(412,785)(643,668)
Income taxes receivable/ payable(596,890)(195,451)
Total adjustments(1,936,880)(5,940,946)
Net cash used in operating activities(1,176,008)(5,096,216)
CASH FLOWS FROM INVESTING ACTIVITIES:  
Proceeds from sale of investments51,035992,729
Stock repurchase (391)
Capital expenditures(605,709)(84,011)
Net cash provided by (used in) investing activities(554,674)908,327
CASH FLOWS FROM FINANCING ACTIVITIES:  
Payment of cash dividend(611,571)(802,337)
Payment on capital leases(6,496)(6,094)
Proceeds from exercise of stock options124,350 
Net cash used in financing activities(493,717)(808,431)
NET DECREASE IN CASH AND CASH EQUIVALENTS(2,224,399)(4,996,320)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD6,515,0679,777,587
CASH AND CASH EQUIVALENTS AT END OF PERIOD4,290,6684,781,267
Cash paid during the period for:  
Interest1,6691,065
Income taxes$ 1,027,000$ 835,000