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Note 7 - Subsequent Event (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				6 Months Ended
	Aug. 06, 2018	Jul. 20, 2018	Sep. 23, 2016	Jun. 30, 2018	Jun. 30, 2017	Jul. 10, 2018
Proceeds from Issuance of Common Stock					$ 47,750
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member]
Debt Instrument, Minimum LIBOR			0.50%
Debt Instrument, Term			3 years 120 days
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			8.00%
Subsequent Event [Member]
Business Combination, Agreement Terminated, Expected Transaction-related Expenses						$ 6,000
Stock Issued During Period, Shares, New Issues	10,454,546
Shares Issued, Price Per Share	$ 5.50
Proceeds from Issuance of Common Stock	$ 53,400
Subsequent Event [Member] | MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 30,000
Debt Instrument, Minimum LIBOR		0.50%
Debt Instrument, Term		2 years 180 days
Subsequent Event [Member] | MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		8.00%

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- Definition

The expected transaction-related expenses that are expected to reimburse to the acquiree due to the merge agreement terminated.

+ References

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- Definition

The minimum LIBOR interest that will be added to the basis spread.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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The cash inflow from the additional capital contribution to the entity.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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