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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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