Note 21 - Segment Reporting - Summary of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021		Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022		Sep. 30, 2021		Dec. 31, 2021
Revenues	$ 7,216		$ 11,900				$ 21,813		$ 34,847
Cost of revenues	7,267		11,857				21,811		35,739
Total operating expenses	1,780		1,617				6,097		10,776
Depreciation and amortization expense included in total operating expenses	552		168						450
Operating Income (Loss), Total	(1,831)		(1,574)				(6,095)		(11,668)
Change in fair value of warrant liabilities	(1,023)		2,853				759		9,682
Net loss	(2,840)		1,374		$ (2,431)	$ (2,959)	(5,271)		(1,585)
Total assets	25,000						25,000				$ 32,631
Operating loss	(1,831)		(1,574)				(6,095)		(11,668)
Expenditure for long-term assets			85						1,466
Corporate, Non-Segment [Member]
Revenues	0		0						0
Cost of revenues	0		0						0
Total operating expenses	707	[1]	623	[2]			2,663	[3]	8,533	[4]
Depreciation and amortization expense included in total operating expenses	21		0				65		1
Operating Income (Loss), Total	(707)		(623)				(2,663)		(8,533)
Change in fair value of warrant liabilities	(1,023)		2,853				759		9,682
Net loss	(1,707)		2,341				(1,800)		1,371
Total assets	39,802						39,802				44,328
Operating loss	(707)		(623)				(2,663)		(8,533)
Expenditure for long-term assets									246
Intersegment Eliminations [Member]
Operating Income (Loss), Total							0
Net loss							0
Total assets	(32,463)						(32,463)				(30,497)
Operating loss							0
Internet Ad [Member] | Operating Segments [Member]
Revenues	7,216		11,773				21,813		34,333
Cost of revenues	7,267		11,482				21,811		34,614
Total operating expenses	628		539				1,517		1,129
Depreciation and amortization expense included in total operating expenses	91		93				270		223
Operating Income (Loss), Total	(679)		(248)				(1,515)		(1,410)
Net loss	(688)		(264)				(1,555)		(1,230)
Total assets	13,279						13,279				12,150
Operating loss	(679)		(248)				(1,515)		(1,410)
Expenditure for long-term assets									1,220
Ecommerce O2O Ad and Marketing Services [Member] | Operating Segments [Member]
Revenues	0		127				0		514
Cost of revenues	0		375				0		1,125
Total operating expenses	80		455				817		1,113
Depreciation and amortization expense included in total operating expenses	75		75				225		225
Operating Income (Loss), Total	(80)		(703)				(817)		(1,724)
Net loss	(80)		(703)				(816)		(1,724)
Total assets	1,101						1,101				2,236
Operating loss	(80)		(703)				(817)		(1,724)
Expenditure for long-term assets			0						0
Corporate Segment [Member]
Revenues							21,813
Cost of revenues							21,811
Total operating expenses							6,097
Depreciation and amortization expense included in total operating expenses							1,660
Change in fair value of warrant liabilities							759
Blockchain Technology [Member] | Operating Segments [Member]
Total operating expenses	365		0				1,100		1
Depreciation and amortization expense included in total operating expenses	365		0				1,100		1
Operating Income (Loss), Total	(365)		0				(1,100)		(1)
Net loss	(365)		0				(1,100)		(2)
Total assets	3,281						3,281				$ 4,414
Operating loss	$ (365)		0				$ (1,100)		(1)
Expenditure for long-term assets			$ 0						$ 0

[1] Including approximately US$0.05 million share-based compensation expenses.

[2] Including approximately US$0.09 million share-based compensation expenses.

[3] Including approximately US$0.14 million share-based compensation expenses.

[4] Including approximately US$6.95 million share-based compensation expenses.