Note 19 - Segment Reporting - Summary of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023		Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023		Dec. 31, 2023	Dec. 31, 2022
Revenues	$ 6,420		$ 9,820			$ 9,951	$ 16,136
Cost of revenues	6,092		9,931			9,551	16,561
Total operating expenses	629		1,225			1,623	2,223
Depreciation and amortization expense included in cost of revenues and total operating expenses	238		323			476	645
Operating Income (Loss)	(301)		(1,336)			(1,223)	(2,648)
Impairment on long-term investment	(2)		(209)			(2)	(209)
Change in fair value of warrant liabilities	0		71			0	172
Net loss	(232)	$ (850)	(1,403)		$ (1,143)	(1,082)	(2,546)
Total Assets	10,843		16,246			10,843	16,246		$ 11,233	$ 19,658
Operating Segments [Member] | Internet Ad [Member]
Revenues	5,670		9,795			9,201	16,086
Cost of revenues	5,672		9,721			9,131	16,141
Total operating expenses	513		334			883	683
Depreciation and amortization expense included in cost of revenues and total operating expenses	8		93			16	184
Operating Income (Loss)	(515)		(260)			(813)	(738)
Impairment on long-term investment	0					0
Change in fair value of warrant liabilities			0				0
Net loss	(520)		(268)			(828)	(750)
Total Assets	7,657		9,755			7,657	9,755		7,966	10,385
Operating Segments [Member] | Ecommerce O2O Ad and Marketing Services [Member]
Revenues	0		0			0	0
Cost of revenues	0		0			0	0
Total operating expenses	4		5			7	9
Depreciation and amortization expense included in cost of revenues and total operating expenses	0		0			0	0
Operating Income (Loss)	(4)		(5)			(7)	(9)
Impairment on long-term investment	0					0
Change in fair value of warrant liabilities			0				0
Net loss	(4)		(4)			(7)	(5)
Total Assets	147		143			147	143		144	156
Operating Segments [Member] | Blockchain Technology [Member]
Revenues	750		25			750	50
Cost of revenues	420		210			420	420
Total operating expenses	0		0			0	0
Depreciation and amortization expense included in cost of revenues and total operating expenses	210		210			420	420
Operating Income (Loss)	330		(185)			330	(370)
Impairment on long-term investment	0					0
Change in fair value of warrant liabilities			0				0
Net loss	540		(185)			330	(371)
Total Assets	1,171		1,262			1,171	1,262		841	1,682
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenues	0		0			0	0
Cost of revenues	0		0			0	0
Total operating expenses	112		886	[1]		733	1,531	[2]
Depreciation and amortization expense included in cost of revenues and total operating expenses	20		20			40	41
Operating Income (Loss)	(112)		(886)			(733)	(1,531)
Impairment on long-term investment	(2)		(209)			(2)	(209)
Change in fair value of warrant liabilities			71				172
Net loss	(248)		(946)			(577)	(1,420)
Total Assets	34,308		37,483			34,308	37,483		34,867	39,136
Intersegment Eliminations [Member]
Revenues	0		0			0	0
Cost of revenues	0		0			0	0
Total operating expenses	0		0			0	0
Depreciation and amortization expense included in cost of revenues and total operating expenses	0		0			0	0
Operating Income (Loss)	0		0			0	0
Impairment on long-term investment	0		0			0	0
Change in fair value of warrant liabilities			0				0
Net loss	0		0			0	0
Total Assets	$ (32,440)		$ (32,397)			$ (32,440)	$ (32,397)		$ (32,585)	$ (31,701)

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

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