CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEETS
Trade accounts receivable, allowance for doubtful accounts (in dollars)	$ 303,656	$ 303,839
Property, plant and equipment, accumulated depreciation (in dollars)	$ 7,516,707	$ 6,876,028
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	5,549,129	5,517,966
Common stock, outstanding shares	5,549,129	5,517,966