Consolidated Balance Sheets [Paranthetical] (USD $)	Mar. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts (in dollars)	$ 12,536	$ 13,036
Convertible preferred stock, par value (in dollars per share)	$ 1	$ 1
Convertible preferred stock, shares authorized	5,000,000	5,000,000
Convertible preferred stock, shares issued	3,350,000	3,350,000
Convertible preferred stock, shares outstanding	3,350,000	3,350,000
Convertible preferred stock, liquidation value (in dollars)	$ 33,500,000	$ 33,500,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	170,000,000	170,000,000
Common stock, shares issued	12,238,780	12,237,644
Common stock, shares outstanding	12,238,780	12,237,644
Treasury stock, shares held	79,545	79,545