Note 2 - Basis of Presentation and Consolidation (Details Textual) - USD ($)	Mar. 31, 2024	Jul. 01, 2023	Jun. 30, 2023
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 10,900,000		$ 12,500,000
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Noncurrent	157,000		(0)
Retained Earnings (Accumulated Deficit)	37,628,000		37,747,000
Accounts Receivable, Allowance for Credit Loss	$ 0	$ 0	$ 0
Accounting Standards Update 2016-13 [Member]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Noncurrent		232,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings (Accumulated Deficit)		$ (183,000)