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Note 6 - Goodwill, Other Intangibles, and Other Assets (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 03, 2018
Additional Amortization Resulting from Termination of Non-compete Agreement   $ 1.3      
Termination of Non-ompete Agreement, Effect on Earnings, after Tax   $ (1.0)      
Termination of Non-comepete Agreement, Effect on Earnings Per Share, after Tax (in dollars per share)   $ (0.06)      
Finite-Lived Intangible Asset, Useful Life (Year)   105 months 128 months    
Amortization of Intangible Assets, Total   $ 5.1 $ 2.9 $ 1.5  
Trade Names [Member]          
Finite-Lived Intangible Asset, Useful Life (Year)   9 months 162 months    
Landair Holdings Inc [Member]          
Business Acquisition, Percentage of Voting Interests Acquired         100.00%
Landair Holdings Inc [Member] | Trade Names [Member]          
Finite-Lived Intangible Assets, Remaining Amortization Period (Month) 15 months        
Acquired Finite-lived Intangible Asset, Residual Value $ 0.5