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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts [Member]      
Balance at Beginning of Year $ 2,494 $ 2,275 $ 2,658
Reserves Established for Acquisitions 1,654 481 672
Additions Charged to Earnings (1,110) (325) (1,264)
Charges to Reserve, Net [1] 2,604 63 209
Balance at End of Year 5,642 2,494 2,275
Inventory Valuation Reserve [Member]      
Balance at Beginning of Year 10,582 9,387 6,558
Reserves Established for Acquisitions 5,359 3,739 2,797
Additions Charged to Earnings (5,357) (3,158) (2,250)
Charges to Reserve, Net [1] 2,447 614 2,282
Balance at End of Year 13,031 10,582 9,387
Valuation Allowance of Deferred Tax Assets [Member]      
Balance at Beginning of Year 1,523 1,385 1,021
Reserves Established for Acquisitions 638 138 364
Additions Charged to Earnings
Charges to Reserve, Net [1] 2,201
Balance at End of Year $ 4,362 $ 1,523 $ 1,385
[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.