Note 4 - Equipment and Leasehold Improvements (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Asset Impairment Charges			$ 0
Depreciation, Depletion and Amortization	$ 373,000	$ 404,000	$ 751,000	$ 811,000

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration