Note 19 - Segment Reporting - Summary of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023		Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023		Dec. 31, 2023	Dec. 31, 2022
Revenues	$ 3,239	$ 9,181				$ 13,190	$ 25,317
Cost of revenues	3,184	9,185				12,735	25,746
Total operating expenses	2,047	1,602				3,670	3,825
Depreciation and amortization expense included in cost of revenues and total operating expenses	237					713
Depreciation and amortization expense included in cost of revenues and total operating expenses		321					966
Operating income/(loss)	(1,992)	(1,606)				(3,215)	(4,254)
Impairment on long-term investment	0	2				(2)	(207)
Gain on disposal of subsidiaries	23	0				23	0
Change in fair value of warrant liabilities	0	13				0	185
Net loss	(1,905)	(1,520)		$ (1,082)	$ (2,546)	(2,987)	(4,066)
Total assets	11,007	14,779				11,007	14,779		$ 11,233	$ 19,658
Operating Segments [Member] | Internet Ad [Member]
Revenues	3,239	9,156				12,440	25,242
Cost of revenues	2,973	8,975				12,104	25,116
Total operating expenses	43	380				926	1,063
Depreciation and amortization expense included in cost of revenues and total operating expenses	7					23
Depreciation and amortization expense included in cost of revenues and total operating expenses		90					274
Operating income/(loss)	222	(199)				(591)	(937)
Impairment on long-term investment						0
Gain on disposal of subsidiaries	22					22
Change in fair value of warrant liabilities		0					0
Net loss	241	(211)				(587)	(961)
Total assets	8,331	9,474				8,331	9,474		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	2				10	11
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)	(3)	(2)				(10)	(11)
Impairment on long-term investment						0
Gain on disposal of subsidiaries	0					0
Change in fair value of warrant liabilities		0					0
Net loss	(2)	(1)				(9)	(6)
Total assets	148	142				148	142		144	156
Operating Segments [Member] | Blockchain Technology [Member]
Revenues	0	25				750	75
Cost of revenues	211	210				631	630
Total operating expenses	0	0				0	0
Depreciation and amortization expense included in cost of revenues and total operating expenses	211					631
Depreciation and amortization expense included in cost of revenues and total operating expenses		210					630
Operating income/(loss)	(211)	(185)				119	(555)
Impairment on long-term investment						0
Gain on disposal of subsidiaries	0					0
Change in fair value of warrant liabilities		0					0
Net loss	(211)	(185)				119	(556)
Total assets	210	1,051				210	1,051		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	2,000	1,220	[1]			2,734	2,751	[2]
Depreciation and amortization expense included in cost of revenues and total operating expenses	19					59
Depreciation and amortization expense included in cost of revenues and total operating expenses		21					62
Operating income/(loss)	(2,000)	(1,220)				(2,733)	(2,751)
Impairment on long-term investment						(2)
Gain on disposal of subsidiaries	1					1
Change in fair value of warrant liabilities		13					185
Net loss	(1,933)	(1,123)				(2,510)	(2,543)
Total assets	34,211	36,525				34,211	36,525		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
Depreciation and amortization expense included in cost of revenues and total operating expenses		0					0
Operating income/(loss)	0	0				0	0
Impairment on long-term investment						0
Gain on disposal of subsidiaries	0
Change in fair value of warrant liabilities		0					0
Net loss	0	0				0	0
Total assets	$ (31,893)	$ (32,413)				$ (31,893)	$ (32,413)		$ (32,585)	$ (31,701)

[1] Including approximately US$0.01 million share-based compensation expenses.

[2] Including approximately US$0.10 million share-based compensation expenses.