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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash Flows From Operating Activities:    
Net income $ 300,412 $ 497,251
Loss from discontinued operations    400,168
Income from continuing operations 300,412 897,419
Adjustments to reconcile income from continuing operations to net cash used in operating activities of continuing operations:    
Depreciation and amortization 192,884 152,427
Gain on marketable securities    (18,112)
Stock based compensation    8,942
Stock issued as compensation for consulting services    76,365
Changes in operating assets and liabilities:    
Trade receivables, net (37,797) 1,002,636
Inventories (1,333,907) (740,883)
Prepaid expenses 20,734 (26,279)
Other assets (19,755) (219)
Accounts payable and accrued expenses (4,670) (2,685,292)
Customer deposits and other liabilities (227,728) (834,869)
Net cash used in operating activities of continuing operations (1,109,827) (2,167,865)
Cash Flows From Investing Activities:    
Payments for property and equipment (177,069) (209,970)
Purchase of available-for-sale investments    (95,000)
Net cash used in investing activities of continuing operations (177,069) (304,970)
Cash Flows From Financing Activities:    
Repayment of debt (54,069) (109,334)
Payments on capital lease obligations (6,622) (5,575)
Net cash used in financing activities of continuing operations (60,691) (114,909)
Cash Flows From Discontinued Operations:    
Net cash used in operating activities of discontinued operations    (96,390)
Net change in cash (1,347,587) (2,684,134)
Cash, beginning of period 4,911,087 5,976,928
Cash, end of period 3,563,500 3,292,794
Supplemental Disclosures:    
Interest 40,390 91,645
Income taxes