Note 20 - Segment Reporting - Summary of Segment Reporting Information (Details) - USD ($) $ in Thousands		3 Months Ended						6 Months Ended				12 Months Ended
		Jun. 30, 2022		Mar. 31, 2022	Jun. 30, 2021		Mar. 31, 2021	Jun. 30, 2022		Jun. 30, 2021		Dec. 31, 2021
Revenues		$ 6,945			$ 14,551			$ 14,597		$ 22,947
Cost of revenues		7,026			14,769			14,544		23,882
Total operating expenses		2,632			8,061			4,317		9,159
Depreciation and amortization expense included in total operating expenses		554			170					282
Operating loss		(2,713)			(8,279)			(4,264)		(10,094)
Change in fair value of warrant liabilities		987			4,322			1,782		6,829		$ (2,039)
Net loss		(1,714)		$ (717)	(3,646)		$ 687	(2,431)		(2,959)
Total assets		27,157						27,157				32,631
Operating loss		(2,713)			(8,279)			(4,264)		(10,094)
Expenditure for long-term assets					221					1,381
Corporate, Non-Segment [Member]
Revenues		0			0					0
Cost of revenues		0			0					0
Total operating expenses		1,256	[1]		7,399	[1]		1,956	[2]	7,910	[1]
Depreciation and amortization expense included in total operating expenses		22			0			44		1
Operating loss		(1,256)			(7,399)			(1,956)		(7,910)
Change in fair value of warrant liabilities		987			4,322			1,782		6,829
Net loss		(239)			(3,061)			(93)		(970)
Total assets		41,101						41,101				44,328
Operating loss		(1,256)			(7,399)			(1,956)		(7,910)
Expenditure for long-term assets										161
Intersegment Eliminations [Member]
Operating loss		0						0
Net loss		0						0
Total assets		(30,183)						(30,183)				(30,497)
Operating loss		0						0
Internet Ad [Member] | Operating Segments [Member]
Revenues		6,945			14,293			14,597		22,560
Cost of revenues		7,026			14,394			14,544		23,132
Total operating expenses		601			207			889	[2]	590
Depreciation and amortization expense included in total operating expenses		90			95			179		130
Operating loss		(682)			(308)			(836)		(1,162)
Net loss		(700)			(12)			(867)		(966)
Total assets		11,388						11,388				12,150
Operating loss		(682)			(308)			(836)		(1,162)
Expenditure for long-term assets										1,220
Ecommerce O2O Ad and Marketing Services [Member] | Operating Segments [Member]
Revenues		0			258			0		387
Cost of revenues		0			375			0		750
Total operating expenses		408			455			737	[2]	658
Depreciation and amortization expense included in total operating expenses		75			75			150		150
Operating loss		(408)			(572)			(737)		(1,021)
Net loss		(408)			(572)			(736)		(1,021)
Total assets		1,188						1,188				2,236
Operating loss		(408)			(572)			(737)		(1,021)
Expenditure for long-term assets					0					0
Corporate Segment [Member]
Revenues								14,597
Cost of revenues								14,544
Total operating expenses	[2]							4,317
Depreciation and amortization expense included in total operating expenses								1,108
Change in fair value of warrant liabilities								1,782
Blockchain Technology [Member] | Operating Segments [Member]
Total operating expenses		367			0			735	[2]	1
Depreciation and amortization expense included in total operating expenses		367			0			735		1
Operating loss		(367)			0			(735)		(1)
Net loss		(367)			(1)			(735)		(2)
Total assets		3,663						3,663				$ 4,414
Operating loss		$ (367)			0			$ (735)		(1)
Expenditure for long-term assets					$ 0					$ 0

[1] Including approximately US$6.76 million share-based compensation expenses.

[2] Including approximately US$0.08 million share-based compensation expenses.