Note 19 - Segment Reporting - Summary of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Revenues	$ 548		$ 6,420		$ 2,200	$ 9,951
Revenues	548		6,420		2,200	9,951
Cost of revenues	501		6,092		1,993	9,551
Cost of revenues	501		6,092		1,993	9,551
Total operating expenses	729		629		1,468	1,623
Total operating expenses	729		629		1,468	1,623
Depreciation and amortization expense included in cost of revenues and total operating expenses	69		238		91	476
Depreciation and amortization expense included in cost of revenues and total operating expenses	69		238		91	476
Operating income/(loss)	(682)		(301)		(1,261)	(1,223)
Net loss	(637)	$ (530)	(232)	$ (850)	(1,167)	(1,082)
Impairment on long-term investment	0		(2)		0	(2)
Total assets	9,246		10,843		9,246	10,843	$ 9,686	$ 11,233
Operating Segments [Member] | Internet Ad [Member]
Revenues	469		5,670		1,488	9,201
Revenues	469		5,670		1,488	9,201
Cost of revenues	443		5,672		1,362	9,131
Cost of revenues	443		5,672		1,362	9,131
Total operating expenses	288		513		302	883
Total operating expenses	288		513		302	883
Depreciation and amortization expense included in cost of revenues and total operating expenses	5		8		12	16
Depreciation and amortization expense included in cost of revenues and total operating expenses	5		8		12	16
Operating income/(loss)	(262)		(515)		(176)	(813)
Net loss	(262)		(520)		(180)	(828)
Impairment on long-term investment			0			0
Total assets	7,399		7,657		7,399	7,657	7,627	7,966
Operating Segments [Member] | IP Services [Member]
Revenues	79				97
Revenues	79				97
Cost of revenues	58				71
Cost of revenues	58				71
Total operating expenses	0				0
Total operating expenses	0				0
Depreciation and amortization expense included in cost of revenues and total operating expenses	58				71
Depreciation and amortization expense included in cost of revenues and total operating expenses	58				71
Operating income/(loss)	21				26
Net loss	21				26
Total assets	636				636		0
Operating Segments [Member] | Ecommerce O2O Ad and Marketing Services [Member]
Revenues			0			0
Revenues			0			0
Cost of revenues			0			0
Cost of revenues			0			0
Total operating expenses			4			7
Total operating expenses			4			7
Depreciation and amortization expense included in cost of revenues and total operating expenses			0			0
Depreciation and amortization expense included in cost of revenues and total operating expenses			0			0
Operating income/(loss)			(4)			(7)
Net loss			(4)			(7)
Impairment on long-term investment			0			0
Total assets			147			147		144
Operating Segments [Member] | Blockchain Technology [Member]
Revenues	0		750		615	750
Revenues	0		750		615	750
Cost of revenues	0		420		560	420
Cost of revenues	0		420		560	420
Total operating expenses	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		210		0	420
Depreciation and amortization expense included in cost of revenues and total operating expenses	0		210		0	420
Operating income/(loss)	0		330		55	330
Net loss	0		540		55	330
Impairment on long-term investment			0			0
Total assets	55		1,171		55	1,171	0	841
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenues	0		0		0	0
Revenues	0		0		0	0
Cost of revenues	0		0		0	0
Cost of revenues	0		0		0	0
Total operating expenses	441		112		1,166	733
Total operating expenses	441		112		1,166	733
Depreciation and amortization expense included in cost of revenues and total operating expenses	6		20		8	40
Depreciation and amortization expense included in cost of revenues and total operating expenses	6		20		8	40
Operating income/(loss)	(441)		(112)		(1,166)	(733)
Net loss	(396)		(248)		(1,068)	(577)
Impairment on long-term investment			(2)			(2)
Total assets	33,860		34,308		33,860	34,308	34,405	34,867
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Revenues	0				0
Revenues	0				0
Cost of revenues	0				0
Cost of revenues	0				0
Total operating expenses	0				0
Total operating expenses	0				0
Depreciation and amortization expense included in cost of revenues and total operating expenses	0				0
Depreciation and amortization expense included in cost of revenues and total operating expenses	0				0
Operating income/(loss)	0				0
Net loss	0				0
Total assets	$ (32,704)				$ (32,704)		$ (32,346)
Intersegment Eliminations [Member]
Revenues			0			0
Revenues			0			0
Cost of revenues			0			0
Cost of revenues			0			0
Total operating expenses			0			0
Total operating expenses			0			0
Depreciation and amortization expense included in cost of revenues and total operating expenses			0			0
Depreciation and amortization expense included in cost of revenues and total operating expenses			0			0
Operating income/(loss)			0			0
Net loss			0			0
Impairment on long-term investment			0			0
Total assets			$ (32,440)			$ (32,440)		$ (32,585)