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Note 11 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Contribution Plan, Cost $ 0.4 $ 0.5
Defined Benefit Plan Average Remaining Work Lifetime 15 years  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 0.5  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 0.5  
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 0.6  
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 0.7  
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 0.8  
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter 4.2  
Minimum [Member]    
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 0.9