Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Receivables, allowance for doubtful accounts	$ 138,687	$ 140,582
Common stock, par value	$ 1	$ 1
Common stock, authorized shares	20,000,000	20,000,000
Common stock, issued shares	10,331,436	10,325,602
Common stock, outstanding shares	10,331,436	10,325,602