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Note 10 - Benefit Plans (Details Textual)
$ in Millions
12 Months Ended
Jan. 30, 2018
Apr. 28, 2014
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined Contribution Plan, Cost | $     $ 0.4 $ 1.4 $ 1.2
Stockholders' Equity Note, Stock Split, Conversion Ratio 1.5543       1.5543
The 2014 Long-Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award, Term (Year)   10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   2,253,735      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)     423,268    
The 2018 Omnibus Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)     4,607,389    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)     2,048,135