CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts (in Dollars)	$ 237,138	$ 202,207
Accumulated depreciation and amortization (in Dollars)	16,349,181	16,035,351
Accumulated amortization (in Dollars)	7,416,801	6,994,772
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	41,383,501	41,058,246
Common stock, shares outstanding	34,357,273	34,044,339
Treasury stock, shares	7,026,228	7,013,907