Note 2 - Acquisitions - Preliminary Price Allocation (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 01, 2021	Dec. 31, 2020
Goodwill	$ 1,174,315		$ 855,228
Acquisition of Deep Sea [Member]
Accounts receivable	9,574
Inventories	9,970
Prepaid expenses and other assets	826
Property and equipment	8,838
Intangible assets	171,437
Goodwill	263,287	$ 263,287
Other assets	3,414
Total assets acquired	467,346
Accounts payable	8,254
Accrued wages and employee benefits	2,106
Other accrued liabilities	3,641
Short-term borrowings	0
Current portion of long-term debt	0
Deferred income taxes	32,545
Long-term debt	0
Other long-term liabilities	100
Net assets acquired	420,700
All Other 2021 Acquisitions [Member]
Accounts receivable	13,478
Inventories	4,522
Prepaid expenses and other assets	1,146
Property and equipment	413
Intangible assets	62,472
Goodwill	79,239
Other assets	4,750
Total assets acquired	166,020
Accounts payable	4,066
Accrued wages and employee benefits	788
Other accrued liabilities	1,903
Short-term borrowings	833
Current portion of long-term debt	233
Deferred income taxes	13,981
Long-term debt	1,672
Other long-term liabilities	5,197
Net assets acquired	$ 137,347
The 2020 Acquisitions [Member]
Accounts receivable			5,094
Inventories			3,575
Prepaid expenses and other assets			858
Property and equipment			635
Intangible assets			26,235
Goodwill			40,395
Other assets			1,122
Total assets acquired			77,914
Accounts payable			4,088
Accrued wages and employee benefits			700
Other accrued liabilities			2,151
Short-term borrowings			0
Current portion of long-term debt			0
Deferred income taxes			3,827
Long-term debt			0
Other long-term liabilities			2,208
Net assets acquired			$ 64,940