Note 20 - Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance at Beginning of Year		$ 4,873	$ 4,805	$ 5,642
Additions Charged to Earnings		3,086	1,941	346
Charges to Reserve, Net	[1]	(1,033)	(2,123)	(1,842)
Reserves Assumed in Acquisition		42	250	659
Balance at End of Year		6,968	4,873	4,805
SEC Schedule, 12-09, Reserve, Inventory [Member]
Balance at Beginning of Year		23,140	15,987	13,031
Additions Charged to Earnings		4,821	10,004	6,164
Charges to Reserve, Net	[1]	(3,867)	(3,720)	(4,036)
Reserves Assumed in Acquisition		199	869	828
Balance at End of Year		24,293	23,140	15,987
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at Beginning of Year		5,802	6,817	4,362
Additions Charged to Earnings		0	478	2,455
Charges to Reserve, Net	[1]	0	0	0
Reserves Assumed in Acquisition		(778)	(1,493)	0
Balance at End of Year		$ 5,024	$ 5,802	$ 6,817

[1] Deductions from the allowance for doubtful accounts equal accounts receivable written off against the allowance, less recoveries. Deductions from the reserves for inventory excess and obsolete items equal inventory written off against the reserve as items were disposed of.