15. QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - Unaudited Quarterly Results (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, 2013	Dec. 31, 2012	Dec. 31, 2011
2013
Net sales	$ 61,559,288	$ 70,176,216	$ 59,419,751	$ 53,715,476	$ 58,263,374	$ 72,539,400	$ 44,408,358	$ 53,325,918	$ 244,870,731	$ 228,537,050	$ 239,968,770
Gross margin	21,821,524	22,739,670	20,310,487	18,670,770	20,949,689	26,182,580	15,351,627	18,022,081	83,542,451	80,505,977	88,300,429
Net income	1,774,184	2,934,196	1,772,280	892,096	2,548,077	5,367,437	218,564	720,687	7,372,756	8,854,765	8,306,895
Dividends paid	$ 751,645	$ 752,933	$ 750,357		$ 0	$ 0	$ 0	$ 0	$ 2,254,935	$ 0
Net income per common share:
Basic (in Dollars per share)	$ 0.24	$ 0.39	$ 0.24	$ 0.12	$ 0.34	$ 0.72	$ 0.03	$ 0.10	$ 0.98	$ 1.18	$ 1.11
Diluted (in Dollars per share)	$ 0.24	$ 0.39	$ 0.24	$ 0.12	$ 0.34	$ 0.72	$ 0.03	$ 0.10	$ 0.98	$ 1.18	$ 1.11