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Note 7 - Deferred Compensation and Long-term Incentive Plans (Details) - Compensation Expense (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Compensation Expense [Abstract]        
Compensation expense $ 377 $ 352 $ 1,077 $ 686