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Note 1 - Significant Accounting Policies - Summaries of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Balance $ 4 $ 19
Additions charged to expense 2 5
Recovery of amounts previously reserved 2 (7)
Amounts written off (13)
Balance at end of year $ 8 $ 4