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Quarterly Financial Data (unaudited): (Details) (USD $)
3 Months Ended 12 Months Ended
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, 2013
Sep. 30, 2012
Sep. 30, 2011
Quarterly Financial Data (unaudited):                      
Net Sales $ 8,037,345 $ 8,778,254 $ 8,214,974 $ 6,536,734 $ 6,928,026 $ 6,134,492 $ 6,760,221 $ 4,755,459 $ 31,567,307 $ 24,578,198 $ 25,737,652
Cost of sales 5,849,877 5,332,798 4,263,580 3,496,482 4,259,701 3,518,867 3,659,505 2,629,860 18,942,737 14,067,933 11,945,184
Gross profit 2,187,468 3,445,456 3,951,394 3,040,252 2,668,325 2,615,625 3,100,716 2,125,599 12,624,570 10,510,265 13,792,468
Operating income (loss) 46,537 285,500 1,210,837 384,591 373,006 355,162 346,543 (658,199) 1,927,465 416,512 607,907
Net income $ 154,727 $ 307,473 $ 1,107,128 $ 317,589 $ 2,773,129 $ 259,971 $ 288,873 $ (342,979) $ 1,886,917 $ 2,978,994 $ 716,590
Net income per common share                      
Basic (in dollars per share) $ 0.01 $ 0.02 $ 0.07 $ 0.02 $ 0.17 $ 0.02 $ 0.02 $ (0.02) $ 0.11 $ 0.18 $ 0.04
Diluted (in dollars per share) $ 0.01 $ 0.02 $ 0.07 $ 0.02 $ 0.17 $ 0.02 $ 0.02 $ (0.02) $ 0.11 $ 0.18 $ 0.04