Note 8 - Segment Reporting - Disaggregation of Revenue (Details) - USD ($)		3 Months Ended				9 Months Ended
		Sep. 30, 2025		Sep. 30, 2024		Sep. 30, 2025		Sep. 30, 2024
Revenue		$ 601,000		$ 578,000		$ 1,815,000		$ 1,815,000
Segment profit		244,000		79,000		720,000		196,000
Interest income, net	[1]	29,000		32,000		104,000		110,000
Loss before income tax expense		(2,290,000)		(1,040,000)		(3,560,000)		(3,150,000)
Severance				46				46
Bad debt recovery						(18,000)		0
Crypto Asset, Unrealized Gain (Loss), Nonoperating		(1,517,000)		0		(1,486,000)		0
Operating Segments [Member]
Revenue		504,000		578,000		1,716,000		1,815,000
Labor and labor-related	[2]	65,000		209,000		210,000		609,000
Cost of Revenue		281,000		261,000		898,000		897,000
Other segment items	[3]	6,000		15,000		1,000		(12,000)
Segment profit		$ 152,000		$ (24,000)		$ 625,000		$ (120,000)
Segment profit margin %
Operating Segments [Member] | Network Services [Member]
Revenue		$ 477,000		$ 502,000		$ 1,457,000		$ 1,489,000
Operating Segments [Member] | Video Collaboration Service [Member]
Revenue		24,000		74,000		249,000		316,000
Operating Segments [Member] | Professional and Other Services [Member]
Revenue		3,000		2,000		10,000		10,000
Operating Segments [Member] | Managed Services [Member]
Revenue		490,000		510,000		1,495,000		1,540,000
Labor and labor-related	[2]	65,000		33,000		197,000		95,000
Cost of Revenue		281,000		261,000		879,000		897,000
Other segment items	[3]	0		1,000		1,000		0
Segment profit		$ 144,000		$ 215,000		$ 418,000		$ 545,000
Segment profit margin %		29.00%		42.00%		28.00%		35.00%
Severance				$ 0				$ 0
Professional services				0				0
Bad debt recovery						$ 0
Operating Segments [Member] | Managed Services [Member] | Network Services [Member]
Revenue		$ 477,000		502,000		1,457,000		1,489,000
Operating Segments [Member] | Managed Services [Member] | Video Collaboration Service [Member]
Revenue		10,000		6,000		28,000		41,000
Operating Segments [Member] | Managed Services [Member] | Professional and Other Services [Member]
Revenue		3,000		2,000		10,000		10,000
Operating Segments [Member] | Managed Services [Member] | Property and Office Expense [Member]
Cost of Revenue								0
Operating Segments [Member] | Managed Services [Member] | Inventory and Inventory-related [Member]
Cost of Revenue				0				0
Operating Segments [Member] | Managed Services [Member] | Other Non-inventory [Member]
Cost of Revenue								3,000
Operating Segments [Member] | Collaboration Products [Member]
Revenue		14,000		68,000		221,000		275,000
Labor and labor-related	[2]	0		176,000		13,000		514,000
Cost of Revenue		0		0		19,000		0
Other segment items	[3]	6,000		14,000		0		(12,000)
Segment profit		$ 8,000		$ (239,000)		$ 207,000		$ (665,000)
Segment profit margin %		57.00%		(351.00%)		94.00%		(242.00%)
Severance				$ 46				$ 46
Professional services				35,000				144,000
Bad debt recovery						$ (18,000)
Operating Segments [Member] | Collaboration Products [Member] | Network Services [Member]
Revenue		$ 0		0		0		0
Operating Segments [Member] | Collaboration Products [Member] | Video Collaboration Service [Member]
Revenue		14,000		68,000		221,000		275,000
Operating Segments [Member] | Collaboration Products [Member] | Professional and Other Services [Member]
Revenue		0		0		0		0
Operating Segments [Member] | Collaboration Products [Member] | Property and Office Expense [Member]
Cost of Revenue								45,000
Operating Segments [Member] | Collaboration Products [Member] | Inventory and Inventory-related [Member]
Cost of Revenue				36,000				185,000
Operating Segments [Member] | Collaboration Products [Member] | Other Non-inventory [Member]
Cost of Revenue								18,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Digital asset revenue, net		(89,000)	[4]			(90,000)	[5]
Other digital asset expenses		107,000	[6]			107,000	[7]
Corporate expenses		936,000	[8]	988,000	[9]	2,786,000	[10]	3,018,000	[11]
Unrealized gain		1,517,000
Interest income, net		(29,000)		(32,000)	[9]	(104,000)		(110,000)	[11]
Loss before income tax expense		$ (2,290,000)		(1,040,000)	[9]	(3,560,000)		(3,150,000)	[11]
Severance				60	[9]			60	[11]
Professional services				35,000				144,000
Bad debt recovery						(18,000)
Crypto Asset, Unrealized Gain (Loss), Nonoperating						$ 1,486,000
Stock compensation	[11]							62,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Property and Office Expense [Member]
Cost of Revenue								45,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Inventory and Inventory-related [Member]
Cost of Revenue				$ 36,000				185,000
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Other Non-inventory [Member]
Cost of Revenue								$ 21,000

[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] Includes direct labor costs (including sales and marketing costs), employment taxes, employee benefits, worker's compensation, and office expenses.

[3] Other segment items include other income and expenses, net, interest expense, certain professional services, and miscellaneous taxes and fees.

[4] Digital asset revenue, net, includes staking reward revenue of $97,000 and $99,000 for the three and nine months ended September 30, 2025, respectively, offset by cost of revenue of $8,000 and $9,000 for the three and nine months ended September 30, 2025, respectively.

[5] Digital asset revenue, net, includes staking reward revenue of $97,000 and $99,000 for the three and nine months ended September 30, 2025, respectively, offset by cost of revenue of $8,000 and $9,000 for the three and nine months ended September 30, 2025, respectively.

[6] Other digital asset expenses include cash advisory fees of $23,000, and stock-based advisory fees of $84,000, for the three and nine months ended September 30, 2025.

[7] Other digital asset expenses include cash advisory fees of $23,000, and stock-based advisory fees of $84,000, for the three and nine months ended September 30, 2025.

[8] 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.

[9] 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.

[10] 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.

[11] 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.