Note 18 - Warrant Liabilities (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Schedule of Warrant Liabilities [Table Text Block]

	As of		As of		As of		Change in Fair Value (gain)/loss
	September 30, 2019		June 30, 2019		December 31, 2018		Nine Months Ended September 30, 2019			Three Months Ended September 30, 2019
Fair value of the Warrants:
Investor warrants		200		32		503		(303	)		168
Placement agent warrants		55		103		103		(48	)		(48	)
Warrant liabilities		255		135		606		(351	)		120

	As of		As of		As of		Change in Fair Value (gain)/loss
		September 30, 2018		June 30, 2018		January 17, 2018		Nine Months Ended September 30, 2018		Three Months Ended September 30, 2018
Fair value of the Warrants:
Investor warrants		684		1,103		1,890		(1,206	)	(419	)
Placement agent warrants		142		224		385		(243	)	(82	)
Warrant liabilities		826		1,327		2,275		(1,449	)	(501	)

Schedule of Warrant Activity [Table Text Block]

	Warrant Outstanding						Warrant Exercisable
	Number of underlying shares		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Number of underlying shares		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price
Balance, January 1, 2019		774,000		1.63	$	6.60		774,000		1.63	$	6.60
Granted/Vested		-						-
Forfeited		-						-
Exercised		-						-
Balance, September 30, 2019 (Unaudited)		774,000		0.88	$	1.4927		774,000		0.88	$	1.4927

Warrant [Member]

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	Investors warrants									Placement agent warrants
	December 31, 2018			June 30, 2019			September 30, 2019			December 31, 2018			June 30, 2019			September 30, 2019
Stock price	$	1.34		$	1.35		$	1.30		$	1.34		$	1.35		$	1.30
Years to maturity		1.55			1.05			0.80			2.05			1.55			1.30
Risk-free interest rate		2.50	%		1.73	%		1.79	%		2.50	%		1.73	%		1.57	%
Dividend yield		-			-			-			-			-			-
Expected volatility		199	%		90	%		82	%		176	%		202	%		83	%
Exercise Price	$	6.60		$	6.60		$	1.4927		$	6.60		$	6.60		$	1.4927
Fair value of the warrant	$	0.78		$	0.05		$	0.31		$	0.80		$	0.80		$	0.43

	Investors warrants									Placement agent warrants
	January 17, 2018			June 30, 2018			September 30, 2018			January 17, 2018			June 30, 2018			September 30, 2018
Stock price	$	3.98		$	2.52		$	1.73		$	3.98		$	2.52		$	1.73
Years to maturity		2.50			2.05			1.80			3.00			2.55			2.30
Risk-free interest rate		2.22	%		2.53	%		2.80	%		2.39	%		2.56	%		2.82	%
Dividend yield		-			-			-			-			-			-
Expected volatility		158	%		174	%		183	%		147	%		159	%		166	%
Exercise Price	$	6.60		$	6.60		$	6.60		$	6.60		$	6.60		$	6.60
Fair value of the warrant	$	2.93		$	1.71		$	1.06		$	2.99		$	1.74		$	1.10