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Note 1 - Summary of Significant Accounting Policies -Self-insurance Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Beginning balance, January 1, $ 37,501 $ 33,995 $ 31,022
Charged to costs and expenses 121,075 90,299 84,209
Due to acquisitions 0 3,279 0
Payments made (114,972) (90,072) (81,236)
Ending balance, December 31, $ 43,604 $ 37,501 $ 33,995