Note 16 - The Financing and Warrant Liabilities - Fair Value of Warrants (Details) $ in Thousands	Dec. 31, 2019 USD ($) yr		Dec. 31, 2018 USD ($) yr	Jan. 31, 2018 USD ($)	Jan. 17, 2018 USD ($) yr
Warrant liabilities as of the closing date US$(’000)	$ 107		$ 606	$ 2,275
Investor Warrants [Member]
Warrant liabilities as of the closing date US$(’000)	71		503	1,890	$ 1,890
Placement Agent Warrants [Member]
Warrant liabilities as of the closing date US$(’000)	$ 36		$ 103	$ 385	$ 385
Measurement Input, Share Price [Member] | Investor Warrants [Member]
Fair value of the warrants	1.17		1.34		3.98
Measurement Input, Share Price [Member] | Placement Agent Warrants [Member]
Fair value of the warrants	1.17		1.34		3.98
Measurement Input, Expected Term [Member] | Investor Warrants [Member]
Fair value of the warrants | yr	0.55		1.55		2.5
Measurement Input, Expected Term [Member] | Placement Agent Warrants [Member]
Fair value of the warrants | yr	1.05		2.05		3
Measurement Input, Risk Free Interest Rate [Member] | Investor Warrants [Member]
Fair value of the warrants	0.0158		0.025		0.0222
Measurement Input, Risk Free Interest Rate [Member] | Placement Agent Warrants [Member]
Fair value of the warrants	0.0157		0.025		0.0239
Measurement Input, Expected Dividend Rate [Member] | Investor Warrants [Member]
Fair value of the warrants
Measurement Input, Expected Dividend Rate [Member] | Placement Agent Warrants [Member]
Fair value of the warrants
Measurement Input, Price Volatility [Member] | Investor Warrants [Member]
Fair value of the warrants	0.6		1.99		1.58
Measurement Input, Price Volatility [Member] | Placement Agent Warrants [Member]
Fair value of the warrants	0.8		1.76		1.47
Measurement Input, Exercise Price [Member] | Investor Warrants [Member]
Fair value of the warrants	1.4927	[1]	6.6		6.6
Measurement Input, Exercise Price [Member] | Placement Agent Warrants [Member]
Fair value of the warrants	1.4927	[1]	6.6		6.6
Measurement Input, Quoted Price [Member] | Investor Warrants [Member]
Fair value of the warrants	0.11		0.78		2.93
Measurement Input, Quoted Price [Member] | Placement Agent Warrants [Member]
Fair value of the warrants	0.28		0.8		2.99

[1] On September 25, 2019, as a result of the close on the first half of the 2019 Financing, the exercise price of the warrants issued in 2018 Financing that contain the "full ratchet" price protection in the event of subsequent issuances below the applicable exercise price (the "Down round feature") was adjusted to $1.4927.