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Note 11 - Derivatives and Fair Value Disclosures (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative, Notional Amount $ 124,869,347 $ 142,500,000  
Derivative, Reference Rate LIBOR 0.48%    
Foreign Currency Forward Contracts Converted, Amount 5,400,000,000    
Derivative Instruments, Income Statement Location of Gain (Loss) Reclassified from Accumulated OCI $54,340 $527,627 $481,515
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 7,550    
Minimum [Member]
      
Interest Rate Swap, Fixed Rate 2.77%    
Maximum [Member]
      
Interest Rate Swap, Fixed Rate 4.73%