CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Allowance for doubtful accounts (in Dollars)	$ 265,308	$ 238,228
Accumulated depreciation and amortization (in Dollars)	15,182,252	12,845,359
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	38,176,541	37,775,381
Common stock, shares outstanding	31,956,063	31,667,600
Treasury stock, shares	6,220,478	6,107,781