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14. QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - Unaudited Quarterly Results - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
2016                      
Net sales $ 66,950,298 $ 73,218,247 $ 62,560,094 $ 57,529,945 $ 65,266,028 $ 70,001,496 $ 68,583,196 $ 65,451,303 $ 260,258,584 $ 269,302,023 $ 286,242,169
Gross margin 21,790,178 19,765,760 16,263,260 18,910,892 22,154,419 22,117,477 22,648,633 21,971,310 76,730,090 88,891,839 $ 96,360,725
Net (loss) income (634,246) 445,629 (1,759,329) (191,450) 1,382,870 1,803,667 2,002,673 1,413,947 (2,139,396) 6,603,157  
Dividends paid $ 816,361 $ 823,564 $ 822,913 $ 834,228 $ 832,401 $ 832,073 $ 831,827 $ 755,953 $ 3,297,066 $ 3,252,254  
Net (loss) income per common share:                      
Basic (in Dollars per share) $ (0.09) $ 0.06 $ (0.23) $ (0.03) $ 0.18 $ 0.24 $ 0.26 $ 0.19 $ (0.29) $ 0.87 $ 1.30
Diluted (in Dollars per share) $ (0.09) $ 0.06 $ (0.23) $ (0.03) $ 0.18 $ 0.24 $ 0.26 $ 0.19 $ (0.29) $ 0.87 $ 1.30