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Note 6 - Renewable Energy Tax Credit Investment (Details Textual) | 3 Months Ended
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Sep. 30, 2023 USD ($)
Amortization of Solar Energy Tax Credit Investment | $ 997,000
Income Tax Credits and Adjustments | 1,100,000
Financial Standby Letter of Credit [Member] |
Guarantor Obligations, Maximum Exposure, Undiscounted | 2,000,000
Investment Tax Credit Carryforward [Member] |
Tax Credit, Committed Investment in the Tax Credit Producing Entity | 1,000,000
Tax Credit, Unfunded Commitment | $ 1,900,000

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