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Note 3 - Accounts Receivable (Details Textual) - USD ($)
6 Months Ended 9 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts Receivable, Noncurrent   $ 1,000,000 $ 500,000
Percentage of Remaining Balance Owned Reserved 48.00% 48.00%