Note 9 - Loans and Related Allowance for Loan Losses (Details Textual) Pure in Thousands	3 Months Ended	6 Months Ended
Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)
Impaired Financing Receivable, Recorded Investment, Total	$ 0			$ 0		$ 0
Financing Receivable, Nonaccrual	$ 0			$ 0		$ 0
Financing Receivable, Modifications, Number of Contracts	0	0		0	0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0	0		0	0
Provision for Loan, Lease, and Other Losses, Total	$ (22,000)	$ (8,000)		$ (36,000)	$ (7,000)
COVID-19 [Member]
Provision for Loan, Lease, and Other Losses, Total	$ (22,000)			$ (43,000)
COVID-19 [Member] \| Forecast [Member]
Provision for Loan, Lease, and Other Losses, Total			$ (44,900)

Number of financing receivables that have been modified by troubled debt restructurings.

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Amount of financing receivable on nonaccrual status.

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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