Note 3 - Summary of Significant Accounting Policies - Summary of Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - Fair Value, Measurements, Recurring [Member] $ in Thousands	Dec. 31, 2018 USD ($)
Warrant liabilities (Note 19)	$ 606
Fair Value, Inputs, Level 1 [Member]
Warrant liabilities (Note 19)
Fair Value, Inputs, Level 2 [Member]
Warrant liabilities (Note 19)
Fair Value, Inputs, Level 3 [Member]
Warrant liabilities (Note 19)	$ 606