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Note 2 - Liquidity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 22, 2018 | Jan. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Common Stock, Par or Stated Value Per Share | $ 0.001 |  | $ 0.001 | $ 0.001
Conversion From Series A Preferred Stock to Common Stock [Member] |  |  |  |
Conversion of Stock, Shares Issued | 1,400,462 | 1,400,462 |  |
Warrants Issued in Connection with the January 2018 Offering [Member] |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 1,000,000 | 1,000,000 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 12 | $ 12 |  |
Class of Warrant or Right, Term | 5 years |  |  |
Warrants Issued in Connection with the January 2018 Offering [Member] | Maximum [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 15 |
Additional Warrants [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | 12 |  |
Underwriter Warrants [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 15 | $ 15 |  |
Class of Warrant or Right, Term | 5 years | 5 years |  |
Underwriter Warrants [Member] | Maximum [Member] |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 50,000 | 50,000 |  |
January 2018 Offering [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues | 1,000,000 | 1,000,000 |  |
Share Price | $ 12 |  |  |
Proceeds from Issuance or Sale of Equity, Total | $ 10,800 | $ 10,800 |  |
January 2018 Offering [Member] | Additional Warrants [Member] |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 131,375 |  |  |

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