CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts (in Dollars)	$ 195,292	$ 165,291
Accumulated depreciation and amortization (in Dollars)	14,798,360	14,633,037
Accumulated amortization (in Dollars)	7,077,177	6,699,283
Preferred stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	5,500	5,500
Preferred stock, shares outstanding	5,500	5,500
Preferred stock, aggregate liquidation preference (in Dollars)	$ 55,000,000	$ 55,000,000
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	40,369,452	39,855,468
Common stock, shares outstanding	33,474,123	33,027,752
Treasury stock, shares	6,895,329	6,827,716