Note 7 - Operating Leases (Details Textual)	12 Months Ended	24 Months Ended
Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)
Operating Leases, Expense, Contingent Rentals	$ 0	$ 0
Operating Lease, Weighted Average Remaining Lease Term (Year)	8 years 7 months 6 days	9 years 1 month 6 days	8 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	7.40%	7.30%	7.40%
Operating Lease, Cost	$ 840,000	$ 818,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	18,000
Operating Lease, Expense	702,000	$ 685,000
State and Local Jurisdiction [Member]
Real Estate Tax Expense	$ 38,000		$ 38,000
Solar Lease for Buildings [Member]
Leases, Number of Lease Properties	2		2
Lessee, Operating Lease, Term of Contract (Year)	84 months		84 months
Equipment [Member]
Lessee, Operating Lease, Term of Contract (Year)	48 months		48 months
HAWAII1 [Member]
Leases, Number of Lease Properties	2		2
HAWAII1 [Member] \| Commercial Lease Expiring in 2035 [Member]
Lessee, Operating Lease, Term of Contract (Year)	40 years		40 years
HAWAII1 [Member] \| Commercial Lease Expiring in 2037 [Member]
Lessee, Operating Lease, Term of Contract (Year)	19 years		19 years

Represents number of lease properties under lease agreement.

No definition available.

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- Definition

The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved.

+ References

No definition available.

+ Details

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land).

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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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