Note 21 - Segment Reporting - Summary of Segment Reporting Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021
Revenues	$ 26,235		$ 47,328
Cost of revenues	26,429		47,230
Total operating expenses	10,925		13,688
Depreciation and amortization expenses included in cost of revenues and operating expenses	2,215		632
Impairment on intangible assets included in operating expenses	2,123
Loss from operations	(11,119)		(13,590)
Impairment on long-term investments	596		0
Change in fair value of warrant liabilities	1,854		11,329
Net loss	(9,791)		(2,688)
Total assets	19,658		32,631
Expenditure for long-term assets			1,494
Corporate, Non-Segment [Member]
Revenues			0
Cost of revenues			0
Total operating expenses	3,713	[1]	9,734	[2]
Depreciation and amortization expenses included in cost of revenues and operating expenses	84		18
Loss from operations	(3,713)		(9,734)
Impairment on long-term investments	520
Change in fair value of warrant liabilities	1,854		11,329
Net loss	(2,254)		990
Total assets	39,136		44,328
Expenditure for long-term assets			280
Intersegment Eliminations [Member]
Impairment on intangible assets included in operating expenses	0
Loss from operations	0		0
Net loss	0		0
Total assets	(31,701)		(30,497)
Expenditure for long-term assets			0
Internet Ad [Member] | Operating Segments [Member]
Revenues	25,810		46,666
Cost of revenues	26,093		45,730
Total operating expenses	3,072		1,423
Depreciation and amortization expenses included in cost of revenues and operating expenses	366		313
Impairment on intangible assets included in operating expenses	0
Loss from operations	(3,355)		(487)
Impairment on long-term investments	76
Net loss	(3,485)		(309)
Total assets	10,385		12,150
Expenditure for long-term assets			1,214
Ecommerce O2O Ad and Marketing Services [Member] | Operating Segments [Member]
Revenues	0		662
Cost of revenues	0		1,500
Total operating expenses	1,764		2,529
Depreciation and amortization expenses included in cost of revenues and operating expenses	300		300
Impairment on intangible assets included in operating expenses	875
Loss from operations	(1,764)		(3,367)
Net loss	(1,764)		(3,366)
Total assets	156		2,236
Expenditure for long-term assets			0
Corporate Segment [Member]
Revenues	26,235
Cost of revenues	26,429
Total operating expenses	10,925
Change in fair value of warrant liabilities	1,854
Blockchain Technology [Member] | Operating Segments [Member]
Cost of revenues	336
Total operating expenses	2,376		2
Depreciation and amortization expenses included in cost of revenues and operating expenses	1,465		1
Impairment on intangible assets included in operating expenses	1,248
Loss from operations	(2,287)		(2)
Net loss	(2,288)		(3)
Total assets	$ 1,682		4,414
Expenditure for long-term assets			$ 0

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

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