Note 24 - Segment Reporting - Summary of Segment Reporting Information (Details) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Revenues		$ 57,146,000	$ 46,633,000
Cost of revenues		54,728,000	42,020,000
Total operating expenses		16,930,000	14,011,000
Depreciation and amortization expense included in total operating expenses		541,000	1,422,000
Impairment on goodwill included in total operating expenses		5,211,000	0
Impairment on intangible assets included in total operating expenses		3,330,000	2,552,000
Operating loss		(14,512,000)	(9,398,000)
Change in fair value of warrant liabilities		1,669,000
Impairment on long-term investments		453,000	44,000
Net loss		(14,127,000)	(10,011,000)
Expenditure for long-term assets		4,180,000	4,000
Total assets		16,968,000	28,560,000
Corporate, Non-Segment [Member]
Revenues		356,000	247,000
Cost of revenues
Total operating expenses	[1]	2,400,000	4,454,000
Depreciation and amortization expense included in total operating expenses		71,000	88,000
Impairment on goodwill included in total operating expenses
Impairment on intangible assets included in total operating expenses
Operating loss		(2,044,000)	(4,207,000)
Change in fair value of warrant liabilities		1,669,000
Impairment on long-term investments		453,000
Net loss		(1,217,000)	(4,238,000)
Expenditure for long-term assets		3,000	2,000
Total assets		17,155,000	11,013,000
Intersegment Eliminations [Member]
Revenues		(356,000)	(247,000)
Cost of revenues
Total operating expenses		(356,000)	(247,000)
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
Operating loss
Change in fair value of warrant liabilities
Impairment on long-term investments
Net loss
Expenditure for long-term assets
Total assets		(16,546,000)	(11,379,000)
Internet Ad [Member] | Operating Segments [Member]
Revenues		57,025,000	46,291,000
Cost of revenues		54,633,000	41,747,000
Total operating expenses		14,658,000	9,730,000
Depreciation and amortization expense included in total operating expenses		469,000	1,333,000
Impairment on goodwill included in total operating expenses		5,211,000
Impairment on intangible assets included in total operating expenses		3,330,000	2,552,000
Operating loss		(12,266,000)	(5,186,000)
Change in fair value of warrant liabilities
Impairment on long-term investments			28,000
Net loss		(12,708,000)	(5,752,000)
Expenditure for long-term assets		431,000	1,000
Total assets		12,756,000	28,524,000
TV Ad [Member] | Operating Segments [Member]
Revenues		121,000	342,000
Cost of revenues		95,000	273,000
Total operating expenses		126,000	74,000
Depreciation and amortization expense included in total operating expenses		1,000	1,000
Impairment on goodwill included in total operating expenses
Impairment on intangible assets included in total operating expenses
Operating loss		(100,000)	(5,000)
Change in fair value of warrant liabilities
Impairment on long-term investments			16,000
Net loss		(100,000)	(21,000)
Expenditure for long-term assets			1,000
Total assets		207,000	$ 402,000
Blockchain Technology [Member] | Operating Segments [Member]
Revenues
Cost of revenues
Total operating expenses		102,000
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
Operating loss		(102,000)
Change in fair value of warrant liabilities
Impairment on long-term investments
Net loss		(102,000)
Expenditure for long-term assets		3,746,000
Total assets		$ 3,396,000

[1] Including approximately US$233,000 share-based compensation expenses.