Note 13 - 401(k) Retirement Plan (Details Textual) - USD ($)	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Defined Contribution 401(k) Retirement Plan [Member]
Defined Contribution Plan, Cost	$ 24,768	$ 24,084

Amount of cost for defined contribution plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration