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Note 4 - Loans And Related Allowance For Loan Losses (Detail) - Troubled Debt Restructurings (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Rate Forgiveness [Member] | Commercial and Industrial [Member]
      
Number of contracts 1 0 0
Rate Forgiveness [Member] | Real Estate Construction [Member]
      
Number of contracts   0  
Rate Forgiveness [Member] | Residential Real Estate Mortgage [Member]
      
Number of contracts 2 0 0
Rate Forgiveness [Member] | Commercial Real Estate Mortgage [Member]
      
Number of contracts   0 0
Rate Forgiveness [Member] | Consumer Installment [Member]
      
Number of contracts 0 0 0
Other Restructurings [Member] | Commercial and Industrial [Member]
      
Number of contracts 12 8 7
Other Restructurings [Member] | Real Estate Construction [Member]
      
Number of contracts   2  
Other Restructurings [Member] | Residential Real Estate Mortgage [Member]
      
Number of contracts 7 10 8
Other Restructurings [Member] | Commercial Real Estate Mortgage [Member]
      
Number of contracts 1 2 3
Other Restructurings [Member] | Consumer Installment [Member]
      
Number of contracts 2 2 3
Commercial and Industrial [Member]
      
Number of contracts 13 8 7
Pre-modification outstanding recorded investment (in Dollars) 489 586 668
Real Estate Construction [Member]
      
Number of contracts   2  
Pre-modification outstanding recorded investment (in Dollars)   3,883  
Residential Real Estate Mortgage [Member]
      
Number of contracts 9 10 8
Pre-modification outstanding recorded investment (in Dollars) 921 1,639 1,230
Commercial Real Estate Mortgage [Member]
      
Number of contracts 1 2 3
Pre-modification outstanding recorded investment (in Dollars) 156 1,625 2,025
Consumer Installment [Member]
      
Number of contracts 2 2 3
Pre-modification outstanding recorded investment (in Dollars) 11 24 43