Note 8 - Segment Reporting - Schedule of Segment Reporting Information by Segment (Details) - USD ($)		3 Months Ended								9 Months Ended
		Sep. 30, 2025		Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024		Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from Contract with Customer, Including Assessed Tax		$ 601,000				$ 578,000				$ 1,815,000	$ 1,815,000
Revenue, Percent of Change		4.00%								0.00%
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization		$ 357,000				$ 499,000				$ 1,095,000	$ 1,619,000
Cost of revenues, Percent of Change		(28.00%)								(32.00%)
Gross Margin		244.00%				79.00%				720.00%	196.00%
Gross Margin, Percent of Change		(209.00%)								(267.00%)
Operating Expenses		$ 1,046,000				$ 1,151,000				$ 2,897,000	$ 3,470,000
Operating expenses, Percent of Change		(9.00%)								(17.00%)
Crypto Asset, Unrealized Gain (Loss), Nonoperating		$ (1,517,000)				0				$ (1,486,000)	0
Interest income, net	[1]	$ 29,000				32,000				$ 104,000	110,000
Interest income, net	[1]	(9.00%)								(5.00%)
Other income (expense), net	[1]	$ (1,488,000)				32,000				$ (1,383,000)	124,000
Other income (expense), Percent of Change	[1]	(4750.00%)								(1215.00%)
Net loss before taxes		$ (2,290,000)				(1,040,000)				$ (3,560,000)	(3,150,000)
Net loss before taxes, Percent of Change		120.00%								13.00%
Income tax expense		$ 0				0				$ 7,000	9,000
Income tax expense, Percent of Change		100.00%								100.00%
Net Income (Loss) Attributable to Parent		$ (2,290,000)		$ (605,000)	$ (672,000)	(1,040,000)		$ (983,000)	$ (1,136,000)	$ (3,567,000)	(3,159,000)
Net loss, Percent of Change		120.00%								13.00%
Digital Assets [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 97,000								$ 99,000
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization		8,000								9,000
Operating Segments [Member]
Revenue from Contract with Customer, Including Assessed Tax		504,000				578,000				1,716,000	1,815,000
Operating Segments [Member] | Digital Assets [Member]
Crypto Asset, Unrealized Gain (Loss), Nonoperating	[1]	$ (1,517,000)				0				$ (1,486,000)	0
Unrealized loss on digital assets	[1]	100.00%								100.00%
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Operating Expenses	[2]	$ 1,043,000				1,047,000				$ 2,897,000	3,140,000
Operating expenses, Percent of Change	[2]	(0.00%)								(8.00%)
Crypto Asset, Unrealized Gain (Loss), Nonoperating										$ 1,486,000
Interest income, net		$ (29,000)				(32,000)	[3]			(104,000)	(110,000)	[4]
Net loss before taxes		(2,290,000)				(1,040,000)	[3]			(3,560,000)	(3,150,000)	[4]
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Digital Assets [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 97,000				0				$ 99,000	0
Revenue, Percent of Change		100.00%								100.00%
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization		$ 8,000				$ 0				$ 9,000	$ 0
Cost of revenues, Percent of Change		0.00%								0.00%
Gross Margin		89.00%				0.00%				90.00%	0.00%
Gross Margin, Percent of Change		100.00%								100.00%
Managed Services [Member] | Operating Segments [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 490,000				$ 510,000				$ 1,495,000	$ 1,540,000
Revenue, Percent of Change		(4.00%)								(3.00%)
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization		$ 345,000				$ 295,000				$ 1,076,000	$ 995,000
Cost of revenues, Percent of Change		17.00%								8.00%
Gross Margin		145.00%				215.00%				419.00%	545.00%
Gross Margin, Percent of Change		(33.00%)								(23.00%)
Operating Expenses	[5],[7]	$ 0	[6]			$ 0	[6]			$ 0	$ 0
Operating expenses, Percent of Change	[5]	0.00%								0.00%
Other income (expense), net	[1]									$ (1,000)	0
Other income (expense), Percent of Change	[1]									(100.00%)
Collaboration Products [Member] | Operating Segments [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 14,000				68,000				$ 221,000	275,000
Revenue, Percent of Change		(79.00%)								(20.00%)
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization		$ 4,000				$ 204,000				$ 10,000	$ 624,000
Cost of revenues, Percent of Change		(98.00%)								(98.00%)
Gross Margin		10.00%				(136.00%)				211.00%	(349.00%)
Gross Margin, Percent of Change		107.00%								160.00%
Operating Expenses	[8]	$ 3,000				$ 104,000				$ 0	$ 330,000
Operating expenses, Percent of Change	[8]	(97.00%)								(100.00%)
Other income (expense), net	[1]									$ 0	$ 14,000
Other income (expense), Percent of Change	[1]									100.00%

[1] Other income (expense) for our segments includes interest expense and non-operating income. Corporate other income includes interest income on our cash and cash equivalents and unrealized gains from the fair-value remeasurement of digital assets.

[2] Corporate operating expenses include costs that are not specific to a particular segment but are general to the group. These include expenses for administrative, information technology, and accounting staff, general liability and other insurance, professional fees, and similar corporate expenses. The three and nine months ended September 30, 2025, also include cash and stock-based advisory fees related to digital assets.

[3] Represents general and administrative costs, less the amounts allocated to the segments for labor and benefits, general liability insurance, professional services, property taxes, and interest income.

[4] Represents general and administrative costs, less the amounts allocated to the segments for labor and benefits, general liability insurance, professional services, property taxes, and interest income.

[5] There were no operating expenses related to our Managed Service segment during the three and nine months ended September 30, 2025, or 2024.

[6] There were no operating expenses related to our Managed Service segment during the three months ended June 30, 2025, or 2024.

[7] There were no operating expenses related to our Managed Service segment during the three months ended September 30, 2025, or 2024.

[8] Operating expenses related to our Collaboration Products Segment include research and development, sales and marketing, and other miscellaneous expenses.