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Note 18 - Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts [Member]      
Balance at Beginning of Year $ 5,642 $ 2,494 $ 2,275
Additions Charged to Earnings 346 1,654 481
Charges to Reserve, Net [1] (1,842) (1,110) (325)
Reserves Assumed in Acquisition 659 2,604 63
Balance at End of Year 4,805 5,642 2,494
Inventory Valuation Reserve [Member]      
Balance at Beginning of Year 13,031 10,582 9,387
Additions Charged to Earnings 6,164 5,359 3,739
Charges to Reserve, Net [1] (4,036) (5,357) (3,158)
Reserves Assumed in Acquisition 828 2,447 614
Balance at End of Year 15,987 13,031 10,582
Valuation Allowance of Deferred Tax Assets [Member]      
Balance at Beginning of Year 4,362 1,523 1,385
Additions Charged to Earnings 2,455 638 138
Charges to Reserve, Net [1]
Reserves Assumed in Acquisition 2,201
Balance at End of Year $ 6,817 $ 4,362 $ 1,523
[1] Deductions from the allowance for doubtful accounts equal accounts receivable written off, less recoveries, against the allowance. Deductions from the reserves for inventory excess and obsolete items equal inventory written off against the reserve as items were disposed of.