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Note 1 - Nature of the Business and Basis of Preparation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 14, 2017	Mar. 31, 2017	Mar. 31, 2016
Shares Issued, Price Per Share	$ 20
Proceeds from Issuance of Common Stock		$ 50,505
IPO [Member]
Stock Issued During Period, Shares, New Issues	174,286
Shares Issued, Price Per Share	$ 20
Proceeds from Issuance of Common Stock	$ 48,171
Private Placement [Member]
Stock Issued During Period, Shares, New Issues	2,541,048
Private Placement [Member] | Nereus Trust [Member]
Stock Issued in Lieu of Royalty Payments	2,112,963

X

- Definition

The number of shares issued in lieu of royalty payments.

+ References

No definition available.

+ Details

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X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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X

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

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X

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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