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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ (736,040) $ 72,797
Adjustments to reconcile net income to net cash used in operating activities:    
Gain on sale of marketable securities 0 (8,410)
Gain on sale of property and equipment (5,024) (187,794)
Change in accounts receivable and inventory reserves 9,528 (146,802)
Depreciation and amortization 178,617 216,540
Change in cash surrender value of life insurance (20,146) (17,001)
Warranty reserve. $ (22,440) 41,200
Compensation expense related to stock options   5,375
Change in operating assets and liabilities:    
Accounts receivable $ (774,712) 386,503
Notes receivable and other non-trade receivables 257,385 275,114
Inventories (3,729,103) (2,603,752)
Prepaid expenses and other assets 211,559 331,869
Accounts payable 639,787 48
Accrued expenses 78,301 (52,301)
Income taxes receivable/ payable (602,588) 21,602
Total adjustments (3,778,836) (1,737,809)
Net cash used in operating activities (4,514,876) (1,665,012)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of marketable securities $ (1,070,456) (108,467)
Proceeds from sale of marketable securities   458,092
Proceeds from sale of property and equipment $ 19,163 548,771
Capital expenditures (219,496) (275,016)
Net cash provided by (used in) investing activities $ (1,270,789) 623,380
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from line of credit   $ 863,050
Payment on line of credit $ (18,704)  
Repurchase of stock options   $ (47,160)
Net cash provided by (used in) financing activities $ (18,704) 815,890
NET DECREASE IN CASH AND CASH EQUIVALENTS (5,804,369) (225,742)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 14,165,120 3,758,888
CASH AND CASH EQUIVALENTS AT END OF PERIOD 8,360,751 3,533,146
SUPPLEMENTAL SCHEDULE OF NON-CASH INVESTING ACTIVITIES:    
Change in fair value of marketable securities (439,298) (82,543)
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Interest 20,497 2,750
Income taxes $ 269,701 $ 17,000