Note 14 - Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Total revenue	$ 3,159	$ 2,958	$ 6,193	$ 3,447
General and administrative	2,208	2,811	4,441	6,602
Depreciation and amortization	864	481	1,472	572
Plant specific operations	362	324	789	398
Plant nonspecific operations	247	227	474	265
Advertising and marketing	89	12	242	12
Total segment operating expenses	4,122	4,221	8,142	8,281
Telecommunications segment operating income (loss)	(963)	(1,263)	(1,949)	(4,834)
Interest income, net	148	395	363	806
Loss on dissenting shareholders' liability	0	(274)	0	(1,103)
Other income expense	21	10	37	10
Consolidated net loss before income taxes and discontinued operations	(789)	(1,102)	(1,528)	(6,802)
Wireless Internet Services [Member]
Total revenue	1,666	1,764	3,338	2,083
Fiber Internet Services [Member]
Total revenue	1,016	773	1,946	879
Product and Service, Other [Member]
Total revenue	477	421	909	485
Cost of other revenue (exclusive of depreciation shown separately)	177	209	353	245
Wireless and Fiber Internet Service [Member]
Cost of other revenue (exclusive of depreciation shown separately)	175	157	371	187
Operating Segments [Member]
Total revenue	3,159	2,958	6,193	3,447
General and administrative	1,252	1,134	2,479	1,965
Depreciation and amortization	829	465	1,401	545
Plant specific operations	363	324	790	398
Plant nonspecific operations	247	227	474	265
Advertising and marketing	85	0	229	0
Total segment operating expenses	3,128	2,516	6,097	3,605
Telecommunications segment operating income (loss)	31	442	96	(158)
Interest income, net	30	472	123	(128)
Operating Segments [Member] | Wireless Internet Services [Member]
Total revenue	1,666	1,764	3,338	2,083
Operating Segments [Member] | Fiber Internet Services [Member]
Total revenue	1,016	773	1,946	879
Operating Segments [Member] | Product and Service, Other [Member]
Total revenue	477	421	909	485
Cost of other revenue (exclusive of depreciation shown separately)	177	209	353	245
Operating Segments [Member] | Wireless and Fiber Internet Service [Member]
Cost of other revenue (exclusive of depreciation shown separately)	175	157	371	187
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
General and administrative	(956)	(1,677)	(1,962)	(4,637)
Depreciation and amortization	(35)	(16)	(71)	(27)
Advertising and marketing	(4)	(12)	(13)	(12)
Emigration tax (expense)	0	0	0	(1,711)
Loss on dissenting shareholders' liability	0	(274)	0	(1,103)
Other income expense	$ 0	$ 10	$ 0	$ 10