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Note 11 - Financial Instruments (Details Textual) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Jan. 17, 2019 USD ($) | Jun. 30, 2019 shares | Dec. 31, 2018 shares
Class of Warrant or Right, Outstanding | shares |  | 333,500 | 1,976,389
Increase (Decrease) in Volatility Rate Applied |  | 5.00% |
Fair Value Assumptions Resulting Increase (Decrease) in Fair Value |  | 0.04% |
Measurement Input, Price Volatility [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input |  | 0.6 |
Interest Rate Swap [Member] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain | $ | $ 213 |  |

X
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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