Note 25 - Segment Reporting - Summary of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017		Dec. 31, 2017
Revenues	$ 22,520		$ 10,500		$ 30,780		$ 17,764
Cost of revenues	21,552		8,800		29,211		14,792
Total operating expenses	9,288		2,122		11,434		4,443
Depreciation and amortization expense included in total operating expenses	211		353		427		707
Impairment on goodwill included in total operating expenses	5,412				5,412
Impairment on intangible assets included in total operating expenses	1,878				1,878
Impairment on long-term investments included in total operating expenses					471
Operating (loss)/income	(8,320)		(422)		(9,865)		(1,471)
Change in fair value of warrant liabilities	(526)				948
Net (loss)/income	(9,554)		(757)		(10,124)		(1,826)
Expenditure for long-term assets	2,556		2		4,205		2
Total assets	21,139				21,139				$ 28,560
Revenues	22,520		10,500		30,780		17,764
Depreciation and amortization expense included in total operating expenses	211		353		427		707
Intersegment Eliminations [Member]
Revenues					(371)
Cost of revenues
Total operating expenses					(371)
Depreciation and amortization expense included in total operating expenses
Impairment on goodwill included in total operating expenses
Impairment on intangible assets included in total operating expenses
Impairment on long-term investments included in total operating expenses
Operating (loss)/income
Change in fair value of warrant liabilities
Net (loss)/income
Expenditure for long-term assets
Total assets	(14,685)				(14,685)				(11,379)
Revenues					(371)
Depreciation and amortization expense included in total operating expenses
Internet Ad [Member] | Operating Segments [Member]
Revenues	22,520		10,500		30,689		17,764
Cost of revenues	21,552		8,800		29,173		14,792
Total operating expenses	8,766		1,621		10,388		3,182
Depreciation and amortization expense included in total operating expenses	192		329		389		658
Impairment on goodwill included in total operating expenses	5,412				5,412
Impairment on intangible assets included in total operating expenses	1,878				1,878
Impairment on long-term investments included in total operating expenses
Operating (loss)/income	(7,798)		79		(8,872)		(210)
Change in fair value of warrant liabilities
Net (loss)/income	(8,198)		(254)		(9,271)		(563)
Expenditure for long-term assets					448
Total assets	12,518				12,518				28,524
Revenues	22,520		10,500		30,689		17,764
Depreciation and amortization expense included in total operating expenses	192		329		389		658
TV Ad [Member] | Operating Segments [Member]
Revenues					91
Cost of revenues					38
Total operating expenses	25		28		47		56
Depreciation and amortization expense included in total operating expenses			1				1
Impairment on goodwill included in total operating expenses
Impairment on intangible assets included in total operating expenses
Impairment on long-term investments included in total operating expenses
Operating (loss)/income	(25)		(28)		6		(56)
Change in fair value of warrant liabilities
Net (loss)/income	(14)		(28)		6		(56)
Expenditure for long-term assets
Total assets	335				335				402
Revenues					91
Depreciation and amortization expense included in total operating expenses			1				1
Blockchain Technology [Member] | Operating Segments [Member]
Revenues
Cost of revenues
Total operating expenses	4				4
Depreciation and amortization expense included in total operating expenses
Impairment on goodwill included in total operating expenses
Impairment on intangible assets included in total operating expenses
Impairment on long-term investments included in total operating expenses
Operating (loss)/income	(4)				(4)
Change in fair value of warrant liabilities
Net (loss)/income	(4)				(4)
Expenditure for long-term assets	2,178				3,378
Total assets	3,447				3,447
Revenues
Depreciation and amortization expense included in total operating expenses
Others [Member] | Operating Segments [Member]
Revenues					371
Cost of revenues
Total operating expenses	493	[1]	473	[2]	1,366	[3]	1,205	[4]
Depreciation and amortization expense included in total operating expenses	19		23		38		48
Impairment on goodwill included in total operating expenses
Impairment on intangible assets included in total operating expenses
Impairment on long-term investments included in total operating expenses					471
Operating (loss)/income	(493)		(473)		(995)		(1,205)
Change in fair value of warrant liabilities	(526)				948
Net (loss)/income	(1,338)		(475)		(855)		(1,207)
Expenditure for long-term assets	378		2		379		2
Total assets	19,524				19,524				$ 11,013
Revenues					371
Depreciation and amortization expense included in total operating expenses	$ 19		$ 23		$ 38		$ 48

[1] Including approximately US$76,000 share-based compensation expenses.

[2] Including approximately US$137,000 share-based compensation expenses.

[3] Including approximately US$151,000 share-based compensation expenses.

[4] Including approximately US$348,000 share-based compensation expenses.