Note 22 - Segment Reporting - Summary of Segment Reporting Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Revenues		$ 38,408		$ 58,080
Cost of revenues		37,776		52,582
Total operating expenses		6,333		7,186
Depreciation and amortization expense included in total operating expenses				170
Operating loss		(5,701)		(1,688)
Change in fair value of warrant liabilities		653		499
Expenditure for long-term assets		2,003		2,122
Total assets		20,667		18,551
Operating loss		(5,701)		(1,688)
Net loss		(5,221)		(1,270)
Total assets		20,667		18,551
Corporate, Non-Segment [Member]
Revenues		1,245		1,202
Cost of revenues		576
Total operating expenses		3,531	[1]	1,943	[2]
Depreciation and amortization expense included in total operating expenses		4		18
Operating loss		(2,862)		(741)
Change in fair value of warrant liabilities		653		499
Expenditure for long-term assets
Total assets		27,766		21,338
Operating loss		(2,862)		(741)
Net loss				(428)
Total assets		27,766		21,338
Intersegment Eliminations [Member]
Revenues
Cost of revenues
Total operating expenses
Depreciation and amortization expense included in total operating expenses
Operating loss
Change in fair value of warrant liabilities
Expenditure for long-term assets
Total assets		(23,024)		(22,079)
Operating loss
Net loss
Total assets		(23,024)		(22,079)
Internet Ad [Member] | Operating Segments [Member]
Revenues		35,618		56,878
Cost of revenues		35,700		52,582
Total operating expenses		2,752		5,176
Depreciation and amortization expense included in total operating expenses		825		150
Operating loss		(2,834)		(880)
Change in fair value of warrant liabilities
Expenditure for long-term assets				1,962
Total assets		8,310		13,332
Operating loss		(2,834)		(880)
Net loss				(778)
Total assets		8,310		13,332
Ecommerce O2O Ad and Marketing Services [Member] | Operating Segments [Member]
Revenues		1,545
Cost of revenues		1,500
Total operating expenses		45		47
Depreciation and amortization expense included in total operating expenses		25
Operating loss				(47)
Change in fair value of warrant liabilities
Expenditure for long-term assets		1,500
Total assets		3,206		2,075
Operating loss				(47)
Net loss				(44)
Total assets		3,206		2,075
Blockchain Technology [Member] | Operating Segments [Member]
Revenues
Cost of revenues
Total operating expenses		5		20
Depreciation and amortization expense included in total operating expenses		2		2
Operating loss		(5)		(20)
Change in fair value of warrant liabilities
Expenditure for long-term assets		503		160
Total assets		4,409		3,885
Operating loss		(5)		(20)
Net loss				(20)
Total assets		4,409		$ 3,885
Corporate Segment [Member]
Revenues		38,408
Cost of revenues		37,776
Total operating expenses	[1]	6,333
Depreciation and amortization expense included in total operating expenses		856
Operating loss		(5,701)
Change in fair value of warrant liabilities		653
Operating loss		$ (5,701)

[1] Including approximately US$2,152,000 share-based compensation expenses.

[2] Including approximately US$393,000 share-based compensation expenses.