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Note 2 - Acquisitions - Preliminary Price Allocation (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Goodwill $ 849,294 $ 855,228
The 2020 Acquisitions [Member]    
Accounts receivable   5,102
Inventories   3,575
Prepaid expenses and other assets   858
Property and equipment   635
Intangible assets   26,257
Goodwill   42,720
Other assets   1,124
Total assets acquired   80,271
Accounts payable   4,088
Accrued wages and employee benefits   700
Other accrued liabilities   2,151
Deferred income taxes   4,134
Other long-term liabilities   4,401
Net assets acquired   $ 64,797