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Note 2 - Fair Value of Financial Instruments (Detail) - Fair Value Measurements (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Financial Assets:        
Carrying Value $ 115,372 $ 45,651 $ 120,104 $ 51,630
Fair Value 115,372 45,651    
Carrying Value 99,515 94,965    
Fair Value 99,515 94,965    
Carrying Value 23,496 23,511    
Fair Value 24,520 24,624    
Carrying Value 6,281 6,281    
Carrying Value 544,602 551,383    
Fair Value 555,582 564,059    
Carrying Value 2,033 2,057    
Fair Value 2,033 2,057    
Financial liabilities:        
Carrying Value 722,372 655,064    
Fair Value 724,000 657,206    
Carrying Value 14,452 14,285    
Fair Value 14,563 14,536    
Carrying Value 8,500 13,500    
Fair Value 4,884 10,146    
Carrying Value 996 1,377    
Fair Value 996 1,377    
Fair Value, Inputs, Level 1 [Member]
       
Financial Assets:        
Fair Value 115,372 45,651    
Financial liabilities:        
Fair Value 212,624 139,526    
Fair Value 3 2    
Fair Value, Inputs, Level 2 [Member]
       
Financial Assets:        
Fair Value 99,515 94,965    
Fair Value 11,491 11,569    
Fair Value 368 283    
Financial liabilities:        
Fair Value 511,376 517,680    
Fair Value 14,563 14,536    
Fair Value 4,884 10,146    
Fair Value 993 1,375    
Fair Value, Inputs, Level 3 [Member]
       
Financial Assets:        
Fair Value 13,029 13,055    
Fair Value 555,582 564,059    
Fair Value $ 1,665 $ 1,774