Condensed Consolidated Statements Of Income (Loss) And Retained Earnings (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Income (Loss) And Retained Earnings [Abstract]
NET SALES	$ 42,261,929	$ 38,565,133	$ 111,425,525	$ 87,359,985
COST OF SALES	38,640,601	32,705,513	98,829,838	80,997,816
Gross profit (loss) from operations	3,621,328	5,859,620	12,595,687	6,362,169
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	4,093,926	3,865,048	12,025,693	11,719,748
Income from operations	(472,598)	1,994,572	569,994	(5,357,579)
OTHER INCOME (EXPENSE):
Interest income	29,117	46,583	86,989	127,222
Interest expense	(121,962)	(159,071)	(359,659)	(380,048)
Gain on sale of equity investments	3,605,597	0	4,173,141	5,197,438
Loss on impairment of equity investments	0	(415,287)	0	(415,287)
Dividend income	19,014	100,073	44,801	207,256
Other, net	76,206	(83,214)	142,630	174,141
Other Income (Expense), Total	3,607,972	(510,916)	4,087,902	4,910,722
Loss before benefit from income taxes	3,135,374	1,483,656	4,657,896	(446,857)
PROVISION FOR (BENEFIT FROM) INCOME TAXES	875,000	415,000	1,300,000	(125,000)
NET INCOME (LOSS)	2,260,374	1,068,656	3,357,896	(321,857)
RETAINED EARNINGS, beg. of period			97,751,202	102,270,564
Less cash dividends	923,136	926,984	1,846,271	1,874,301
Less purchase and retirement of capital stock	0	241,312	0	2,234,069
RETAINED EARNINGS, end of period	$ 99,262,827	$ 97,840,337	$ 99,262,827	$ 97,840,337
Basic earnings (loss) per share	$ 0.56	$ 0.27	$ 0.84	$ (0.08)
Cash dividends per share	$ 0.23	$ 0.23	$ 0.46	$ 0.46