Note 5 - Leases - Summary Analysis of Annual Undiscounted Cash Flows to be Received on Leases (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Statement [Line Items]
2023 (excluding the nine months ended March 31, 2023)	$ 10
2024	42
2025	36
2026	0
2027	0
Thereafter	0
Total lease payments	$ 88