CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Allowance for doubtful accounts (in Dollars)	$ 140,027	$ 158,870
Accumulated depreciation and amortization (in Dollars)	15,036,740	13,466,365
Accumulated amortization (in Dollars)	5,852,290	5,529,730
Preferred stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in Shares)	10,000,000	10,000,000
Preferred stock, shares issued (in Shares)	5,500	5,500
Preferred stock, shares outstanding (in Shares)	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 (in Shares)	100,000,000	100,000,000
Common stock, shares issued (in Shares)	39,441,933	38,461,595
Common stock, shares outstanding (in Shares)	32,755,904	32,131,188
Treasury stock, shares (in Shares)	6,686,029	6,330,407