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Note 1 - Summary of Significant Accounting Policies - Self-insurance Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Beginning balance, January 1, $ 43,604 $ 37,501 $ 33,995
Charged to costs and expenses 105,739 121,075 90,299
Due to acquisitions 0 0 3,279
Payments made (103,907) (114,972) (90,072)
Ending balance, December 31, $ 45,436 $ 43,604 $ 37,501