Note 18 - Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance at Beginning of Year		$ 4,805	$ 5,642	$ 2,494
Additions Charged to Earnings		1,941	346	1,654
Charges to Reserve, Net	[1]	(2,123)	(1,842)	(1,110)
Reserves Assumed in Acquisition		250	659	2,604
Balance at End of Year		4,873	4,805	5,642
SEC Schedule, 12-09, Reserve, Inventory [Member]
Balance at Beginning of Year		15,987	13,031	10,582
Additions Charged to Earnings		10,004	6,164	5,359
Charges to Reserve, Net	[1]	(3,720)	(4,036)	(5,357)
Reserves Assumed in Acquisition		869	828	2,447
Balance at End of Year		23,140	15,987	13,031
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at Beginning of Year		6,817	4,362	1,523
Additions Charged to Earnings		478	2,455	638
Charges to Reserve, Net	[1]
Reserves Assumed in Acquisition				2,201
Balance at End of Year		5,802	$ 6,817	$ 4,362
Reserves Assumed in Acquisition		$ (1,493)

[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.