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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Retained Earnings (Accumulated Deficit), Ending Balance $ (82,719,000)   $ (72,450,000)    
Cash and Cash Equivalents, at Carrying Value, Ending Balance $ 4,820,000   $ 12,689,000 $ 13,326,000 $ 21,352,000
Accounting Standards Update 2014-09 [Member]          
Retained Earnings (Accumulated Deficit), Ending Balance   $ (76,000)