Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets
Trade accounts receivable, allowance for doubtful accounts (in dollars)	$ 303,839	$ 150,921
Capital stock, Authorized shares	3,000,000	3,000,000
Capital stock, issued shares	0	0
Capital stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, Authorized shares	22,000,000	22,000,000
Common stock, issued shares	5,517,966	5,438,810
Common stock, outstanding shares	5,517,966	5,438,810