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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Stock-based compensation $ 434,069 $ 619,100
Interest expense reclassified from other comprehensive income    1,590,905
Unrealized gain (loss) on securities, income tax expense 1,940 74,666
Change in fair value of derivative financial instruments, income tax benefit   14,053
Unrealized loss on derivative financial instruments reclassified to interest expense, income tax expense   614,408
Station operating expenses [Member]
    
Stock-based compensation 4,330 5,730
Corporate general and administrative expenses [Member]
    
Stock-based compensation $ 429,739 $ 613,370