Note 9 - Leases (Details Textual) - USD ($)	Jun. 30, 2023	Mar. 31, 2023
Operating Lease, Liability, Current	$ 142,000	$ 139,000
Finance Lease, Liability, Current	1,000	1,000
Operating Lease, Liability, Noncurrent	25,000	62,000
Finance Lease, Liability, Noncurrent	0	0
Operating Lease, Right-of-Use Asset	166,000	200,000
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	$ 1,000	$ 1,000
Minimum [Member]
Lessee, Operating Lease, Term of Contract (Month)	12 months
Maximum [Member]
Lessee, Operating Lease, Term of Contract (Month)	14 months