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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stock-based compensation     $ 237,956 $ 325,560
Interest expense reclassified from other comprehensive income    405,437    1,187,409
Unrealized gain on securities from income tax expense 8,329 54,635 7,911 41,401
Change in fair value of derivative financial instruments, income tax benefit   7,055   14,159
Unrealized loss on derivative financial instruments reclassified to interest expense, income tax expense   156,580   458,578
Station operating expenses
        
Stock-based compensation 4,741 9,420 7,512 22,650
Corporate general and administrative expenses
        
Stock-based compensation $ 103,322 $ 162,561 $ 230,444 $ 302,910