Note 12 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Dec. 31, 2024 |
|
| Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) | $ 1,500 | $ 793,000 | |
| Bank of North Dakota [Member] | |||
| Letters of Credit Outstanding, Amount | 0 | $ 50,000 | |
| Bank of North Dakota [Member] | Letter of Credit [Member] | |||
| Debt Instrument, Collateral Amount | 517,900 | 524,900 | |
| Federal Home Loan Bank of Des Moines [Member] | |||
| Letters of Credit Outstanding, Amount | 6,400 | 12,000 | |
| Unfunded Loan Commitment [Member] | |||
| Off-Balance-Sheet, Credit Loss, Liability | 6,000 | $ 7,500 | |
| Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) | $ (1,500) | $ (793) | |