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Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Estimate of Fair Value Measurement [Member]
    
Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]    
Derivative instruments $ (1,670) $ (947)
Preferred stock, trust preferred securities, auction rate securities, and other equity instruments 98,566 87,768
Fair Value, Inputs, Level 1 [Member]
    
Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]    
Derivative instruments (1,670) (947)
Preferred stock, trust preferred securities, auction rate securities, and other equity instruments 98,566 87,768
Fair Value, Inputs, Level 2 [Member]
    
Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]    
Derivative instruments      
Preferred stock, trust preferred securities, auction rate securities, and other equity instruments      
Fair Value, Inputs, Level 3 [Member]
    
Note 10 - Fair value measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]    
Derivative instruments      
Preferred stock, trust preferred securities, auction rate securities, and other equity instruments