Note 5 - Other Long-Term Obligations and Commitments - Schedule of Operating Lease Obligations (Details)	Mar. 31, 2024 USD ($)
Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year	$ 601,000
Lessee, Operating Lease, Liability, to be Paid, Year One	149,000
Total undiscounted lease payments	750,000
Less: Amount associated with discounting	(58,000)
Total net operating lease liabilities	$ 692,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of asset retirement and other long-term obligations
Less: Current portion included in Other current liabilities	$ 692,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Long-Term Obligations
Non-current portion included in Other liabilities	$ 0