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Note 19 - Pension Plan (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Expected Future Benefit Payments Over Next 10 Years $ 0    
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Amount, Ending Balance 10    
Pension Plan [Member]      
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 9,673 $ 4  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 395 689  
Defined Benefit Plan, Actuarial Gain on Plan Assets 9,277 685  
Defined Benefit Plan, Plan Assets, Amount, Ending Balance $ 10 $ 37,177 $ 38,813