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Note 9 - Retirement Plans (Detail) - Active pension plan fair value measurements (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets:    
Fair Value of Plan Assets $ 46,662 $ 35,011
Insurance General Account [Member] | Fair Value, Inputs, Level 1 [Member]
   
Assets:    
Fair Value of Plan Assets 0 0
Insurance General Account [Member] | Fair Value, Inputs, Level 2 [Member]
   
Assets:    
Fair Value of Plan Assets 17,381 13,335
Insurance General Account [Member] | Fair Value, Inputs, Level 3 [Member]
   
Assets:    
Fair Value of Plan Assets 0 0
Insurance General Account [Member]
   
Assets:    
Fair Value of Plan Assets 17,381 13,335
Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
   
Assets:    
Fair Value of Plan Assets 0 0
Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
   
Assets:    
Fair Value of Plan Assets 1,457 846
Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
   
Assets:    
Fair Value of Plan Assets 0 0
Cash Equivalents [Member]
   
Assets:    
Fair Value of Plan Assets 1,457 846
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
   
Assets:    
Fair Value of Plan Assets 0 0
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
   
Assets:    
Fair Value of Plan Assets 24,911 18,668
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
   
Assets:    
Fair Value of Plan Assets 0 0
Equity Securities [Member]
   
Assets:    
Fair Value of Plan Assets 24,911 18,668
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
   
Assets:    
Fair Value of Plan Assets 0 0
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
   
Assets:    
Fair Value of Plan Assets 2,913 2,162
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
   
Assets:    
Fair Value of Plan Assets 0 0
Fixed Income Securities [Member]
   
Assets:    
Fair Value of Plan Assets 2,913 2,162
Fair Value, Inputs, Level 1 [Member]
   
Assets:    
Fair Value of Plan Assets 0 0
Fair Value, Inputs, Level 2 [Member]
   
Assets:    
Fair Value of Plan Assets 46,662 35,011
Fair Value, Inputs, Level 3 [Member]
   
Assets:    
Fair Value of Plan Assets $ 0 $ 0