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Note 1 - Summary of Significant Accounting Policies - Summary of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Beginning balance $ 1,345 $ 1,857 $ 1,767
Provision (reversal) for losses on accounts receivable 454 (241) 1,100
Write-offs and other deductions (343) (271) (1,010)
Ending balance $ 1,456 $ 1,345 $ 1,857