Note 11 - Financial Instruments (Details Textual)	6 Months Ended
Jun. 30, 2017 shares	Dec. 31, 2016 shares	Jun. 30, 2016 shares
Class of Warrant or Right, Outstanding	2,399,141	2,673,406	5,273,820
Fair Value Assumptions Expected Volatility Rate Calculation Basis	2 years
Fair Value Assumptions, Expected Volatility Rate	169.16%
Increase (Decrease) in Volatility Rate Applied	5.00%
Fair Value Assumptions Resulting Increase (Decrease) in Fair Value	8.20%
Interest Rate Swap [Member] \| ABN Armo Bank of Holland [Member]
Derivative, Number of Instruments Held	3

Basis for calculating volatility rate, measured using a trailing average of the Company's share price.

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- Definition

Increase (decrease) in the fair value of financial instruments based on a change in assumptions used in the valuation model.

+ References

No definition available.

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- Definition

Increase or (decrease) in the volatility rate used in the valuation model to calculate the fair value of a financial instrument.

+ References

No definition available.

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- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
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