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UNAUDITED QUARTERLY FINANCIAL DATA (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product sales | $ 1,559,248 | $ 1,234,701 | $ 1,366,493 | $ 1,846,734 | $ 1,420,951 | $ 1,076,749 | $ 1,175,126 | $ 1,717,109 | $ 1,304,548 | $ 1,003,451 | $ 1,247,443 | $ 1,555,701 | $ 6,007,176 | $ 5,389,935 | $ 5,111,143
Gross margin | 607,644 | 615,717 | 783,677 | 1,053,567 | 750,215 | 620,958 | 670,518 | 1,012,568 | 725,009 | 526,034 | 694,526 | 868,235 | 3,060,606 | 3,054,259 | 2,813,804
Product development expenses | 325,010 | 290,853 | 271,858 | 266,479 | 234,316 | 223,771 | 211,706 | 247,807 | 271,076 | 304,082 | 672,763 | 472,134 | 1,154,200 | 917,600 | 1,720,055
Net operating income (loss) | (209,975) | (159,967) | 23,722 | 326,666 | 12,497 | (86,126) | 37,397 | 281,233 | 9,382 | (192,390) | (432,860) | (16,858) | (19,552) | 245,001 | (632,726)
Net income (loss) | $ (150,703) | $ 57,336 | $ 6,452 | $ 204,310 | $ (16,862) | $ (63,574) | $ 15,187 | $ 154,761 | $ (530) | $ (127,649) | $ (258,218) | $ (23,113) | $ 117,395 | $ 89,512 | $ (409,510)
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollar per share) | $ (0.05) | $ 0.02 | $ 0.00 | $ 0.07 | $ (0.01) | $ (0.02) | $ 0.01 | $ 0.05 | $ 0.00 | $ (0.04) | $ (0.09) | $ (0.01) | $ 0.04 | $ 0.03 | $ (0.14)
Diluted (in dollar per share) | $ (0.05) | $ 0.02 | $ 0.00 | $ 0.07 | $ (0.01) | $ (0.02) | $ 0.01 | $ 0.05 | $ 0.00 | $ (0.04) | $ (0.09) | $ (0.01) | $ 0.04 | $ 0.03 | $ (0.14)

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