Note 2 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Sep. 30, 2025

Notes Tables

Schedule of Property, Plant, and Equipment Useful Lives [Table Text Block]

Asset	Estimated Useful Life
Fiber plant	15 - 30 years
Equipment	3 - 7 years
Leasehold improvements	Lesser of lease term or useful life (generally 6 - 15 years)
Furniture and fixtures	5 - 7 years
Tower Sites and Construction Equipment	5 - 10 years

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Balance of Dissenting Shareholders' Liability as of April 1, 2024	$	-
Initial value upon re-domestication		4,526
Change in fair value		1,103
Cash settlement of dissenting shareholders' liability		(5,629	)
Balance of Dissenting Shareholders' Liability as of September 30, 2025	$	-

Balance of Dissenting Shareholders' Liability as of April 1, 2024	$	-
Initial value upon re-domestication		4,526
Change in fair value		1,103
Cash settlement of dissenting shareholders' liability		(5,629	)
Balance of Dissenting Shareholders' Liability as of September 30, 2025	$	-

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	Fair Value Measurement Using (In thousands)
Description	Level 1		Level 2		Level 3		Fair Value		Carrying Value
Cash and restricted cash:
September 30, 2025	$	8,414	$	-	$	-	$	8,414	$	8,414
March 31, 2025	$	1,400	$	-	$	-	$	1,400	$	1,400
Cash equivalents:
September 30, 2025	$	11,363	$	-	$	-	$	11,363	$	11,363
March 31, 2025	$	23,429	$	-	$	-	$	23,429	$	23,429