Note 3 - Loans - Summary of Loan Credit Quality (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 |
Financing receivable, originated | $ 692,664 | | $ 692,664 | | $ 651,928 |
Mortgage Receivable [Member] | | | | | |
Financing receivable, originated | 596,905 | | 596,905 | | 560,009 |
Loans and Finance Receivables [Member] | | | | | |
Financing receivable, originated | 692,664 | | 692,664 | | 651,928 |
Current period gross writeoffs, originated | 13 | $ 55 | 843 | $ 423 | |
Commercial Real Estate Portfolio Segment [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 15,985 | | 15,985 | | 26,574 |
Financing receivable, originated in fiscal year before latest fiscal year | 28,610 | | 28,610 | | 59,554 |
Financing receivable, originated two fiscal years before latest fiscal year | 61,667 | | 61,667 | | 29,233 |
Financing receivable, originated three fiscal years before latest fiscal year | 28,179 | | 28,179 | | 40,719 |
Financing receivable, originated four fiscal years before latest fiscal year | 34,341 | | 34,341 | | 12,492 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 44,781 | | 44,781 | | 37,812 |
Financing receivable, originated, revolving | 2,816 | | 2,816 | | 2,045 |
Financing receivable, originated | 216,379 | | 216,379 | | 208,429 |
Year-to-date gross charge-offs | | | 0 | | 0 |
Fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Second fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Third fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Fourth fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Fifth and prior fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Current period gross writeoffs, revolving | | | 0 | | 0 |
Current period gross writeoffs, originated | 0 | 0 | 0 | 0 | 0 |
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 15,985 | | 15,985 | | 26,574 |
Financing receivable, originated in fiscal year before latest fiscal year | 28,610 | | 28,610 | | 59,554 |
Financing receivable, originated two fiscal years before latest fiscal year | 61,667 | | 61,667 | | 29,233 |
Financing receivable, originated three fiscal years before latest fiscal year | 28,179 | | 28,179 | | 40,719 |
Financing receivable, originated four fiscal years before latest fiscal year | 34,341 | | 34,341 | | 12,492 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 43,011 | | 43,011 | | 36,045 |
Financing receivable, originated, revolving | 2,816 | | 2,816 | | 2,045 |
Financing receivable, originated | 214,609 | | 214,609 | | 206,662 |
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated in fiscal year before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated two fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated three fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated four fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 1,715 | | 1,715 | | 1,767 |
Financing receivable, originated, revolving | 0 | | 0 | | 0 |
Financing receivable, originated | 1,715 | | 1,715 | | 1,767 |
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated in fiscal year before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated two fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated three fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated four fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 55 | | 55 | | 0 |
Financing receivable, originated, revolving | 0 | | 0 | | 0 |
Financing receivable, originated | 55 | | 55 | | 0 |
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 23,941 | | 23,941 | | 43,809 |
Financing receivable, originated in fiscal year before latest fiscal year | 47,994 | | 47,994 | | 55,374 |
Financing receivable, originated two fiscal years before latest fiscal year | 54,381 | | 54,381 | | 66,498 |
Financing receivable, originated three fiscal years before latest fiscal year | 65,177 | | 65,177 | | 31,984 |
Financing receivable, originated four fiscal years before latest fiscal year | 29,318 | | 29,318 | | 11,717 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 38,123 | | 38,123 | | 30,456 |
Financing receivable, originated, revolving | 38,953 | | 38,953 | | 33,545 |
Financing receivable, originated | 297,887 | | 297,887 | | 273,383 |
Year-to-date gross charge-offs | | | 0 | | 0 |
Fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Second fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Third fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Fourth fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Fifth and prior fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Current period gross writeoffs, revolving | | | 0 | | 0 |
Current period gross writeoffs, originated | 0 | 0 | 0 | | 0 |
Residential Portfolio Segment [Member] | Pass [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 23,941 | | 23,941 | | 43,809 |
Financing receivable, originated in fiscal year before latest fiscal year | 47,994 | | 47,994 | | 55,374 |
Financing receivable, originated two fiscal years before latest fiscal year | 53,929 | | 53,929 | | 64,522 |
Financing receivable, originated three fiscal years before latest fiscal year | 63,236 | | 63,236 | | 31,339 |
Financing receivable, originated four fiscal years before latest fiscal year | 28,374 | | 28,374 | | 11,717 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 37,924 | | 37,924 | | 30,253 |
Financing receivable, originated, revolving | 38,143 | | 38,143 | | 33,144 |
Financing receivable, originated | 293,541 | | 293,541 | | 270,158 |
Residential Portfolio Segment [Member] | Special Mention [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated in fiscal year before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated two fiscal years before latest fiscal year | 354 | | 354 | | 1,391 |
Financing receivable, originated three fiscal years before latest fiscal year | 1,370 | | 1,370 | | 278 |
Financing receivable, originated four fiscal years before latest fiscal year | 325 | | 325 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 199 | | 199 | | 203 |
Financing receivable, originated, revolving | 247 | | 247 | | 357 |
Financing receivable, originated | 2,495 | | 2,495 | | 2,229 |
Residential Portfolio Segment [Member] | Substandard [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated in fiscal year before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated two fiscal years before latest fiscal year | 98 | | 98 | | 585 |
Financing receivable, originated three fiscal years before latest fiscal year | 571 | | 571 | | 367 |
Financing receivable, originated four fiscal years before latest fiscal year | 619 | | 619 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated, revolving | 563 | | 563 | | 44 |
Financing receivable, originated | 1,851 | | 1,851 | | 996 |
Real Estate Construction Loan [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 28,369 | | 28,369 | | 34,896 |
Financing receivable, originated in fiscal year before latest fiscal year | 16,909 | | 16,909 | | 17,276 |
Financing receivable, originated two fiscal years before latest fiscal year | 8,766 | | 8,766 | | 12,563 |
Financing receivable, originated three fiscal years before latest fiscal year | 17,728 | | 17,728 | | 1,809 |
Financing receivable, originated four fiscal years before latest fiscal year | 1,222 | | 1,222 | | 1,611 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 1,568 | | 1,568 | | 1,997 |
Financing receivable, originated, revolving | 8,077 | | 8,077 | | 8,045 |
Financing receivable, originated | 82,639 | | 82,639 | | 78,197 |
Year-to-date gross charge-offs | | | 0 | | 0 |
Fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Second fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Third fiscal year before current fiscal year period gross writeoffs | | | 0 | | 386 |
Fourth fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Fifth and prior fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Current period gross writeoffs, revolving | | | 0 | | 0 |
Current period gross writeoffs, originated | 0 | 40 | 0 | 386 | 386 |
Real Estate Construction Loan [Member] | Pass [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 28,369 | | 28,369 | | 34,896 |
Financing receivable, originated in fiscal year before latest fiscal year | 16,909 | | 16,909 | | 17,078 |
Financing receivable, originated two fiscal years before latest fiscal year | 8,588 | | 8,588 | | 12,563 |
Financing receivable, originated three fiscal years before latest fiscal year | 17,728 | | 17,728 | | 1,425 |
Financing receivable, originated four fiscal years before latest fiscal year | 803 | | 803 | | 1,611 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 1,568 | | 1,568 | | 1,997 |
Financing receivable, originated, revolving | 8,077 | | 8,077 | | 8,045 |
Financing receivable, originated | 82,042 | | 82,042 | | 77,615 |
Real Estate Construction Loan [Member] | Special Mention [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated in fiscal year before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated two fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated three fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated four fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated, revolving | 0 | | 0 | | 0 |
Financing receivable, originated | 0 | | 0 | | 0 |
Real Estate Construction Loan [Member] | Substandard [Member] | Mortgage Receivable [Member] | | | | | |
Financing receivable, originated in current fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated in fiscal year before latest fiscal year | 0 | | 0 | | 198 |
Financing receivable, originated two fiscal years before latest fiscal year | 178 | | 178 | | 0 |
Financing receivable, originated three fiscal years before latest fiscal year | 0 | | 0 | | 384 |
Financing receivable, originated four fiscal years before latest fiscal year | 419 | | 419 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated, revolving | 0 | | 0 | | 0 |
Financing receivable, originated | 597 | | 597 | | 582 |
Commercial Portfolio Segment [Member] | Loans and Finance Receivables [Member] | | | | | |
Financing receivable, originated in current fiscal year | 6,489 | | 6,489 | | 12,048 |
Financing receivable, originated in fiscal year before latest fiscal year | 10,965 | | 10,965 | | 12,130 |
Financing receivable, originated two fiscal years before latest fiscal year | 10,882 | | 10,882 | | 7,247 |
Financing receivable, originated three fiscal years before latest fiscal year | 5,351 | | 5,351 | | 3,624 |
Financing receivable, originated four fiscal years before latest fiscal year | 2,621 | | 2,621 | | 4,823 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 6,156 | | 6,156 | | 5,282 |
Financing receivable, originated, revolving | 47,324 | | 47,324 | | 40,829 |
Financing receivable, originated | 89,788 | | 89,788 | | 85,983 |
Year-to-date gross charge-offs | | | 0 | | 0 |
Fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Second fiscal year before current fiscal year period gross writeoffs | | | 75 | | 0 |
Third fiscal year before current fiscal year period gross writeoffs | | | 83 | | 0 |
Fourth fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Fifth and prior fiscal year before current fiscal year period gross writeoffs | | | 607 | | 1 |
Current period gross writeoffs, revolving | | | 0 | | 0 |
Current period gross writeoffs, originated | 0 | 0 | 765 | 0 | 1 |
Commercial Portfolio Segment [Member] | Pass [Member] | Loans and Finance Receivables [Member] | | | | | |
Financing receivable, originated in current fiscal year | 6,489 | | 6,489 | | 12,024 |
Financing receivable, originated in fiscal year before latest fiscal year | 10,961 | | 10,961 | | 12,130 |
Financing receivable, originated two fiscal years before latest fiscal year | 10,882 | | 10,882 | | 7,247 |
Financing receivable, originated three fiscal years before latest fiscal year | 5,351 | | 5,351 | | 3,543 |
Financing receivable, originated four fiscal years before latest fiscal year | 2,621 | | 2,621 | | 4,823 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 6,121 | | 6,121 | | 5,250 |
Financing receivable, originated, revolving | 44,659 | | 44,659 | | 40,064 |
Financing receivable, originated | 87,084 | | 87,084 | | 85,081 |
Commercial Portfolio Segment [Member] | Special Mention [Member] | Loans and Finance Receivables [Member] | | | | | |
Financing receivable, originated in current fiscal year | 0 | | 0 | | 24 |
Financing receivable, originated in fiscal year before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated two fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated three fiscal years before latest fiscal year | 0 | | 0 | | 45 |
Financing receivable, originated four fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 35 | | 35 | | 32 |
Financing receivable, originated, revolving | 2,665 | | 2,665 | | 0 |
Financing receivable, originated | 2,700 | | 2,700 | | 101 |
Commercial Portfolio Segment [Member] | Substandard [Member] | Loans and Finance Receivables [Member] | | | | | |
Financing receivable, originated in current fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated in fiscal year before latest fiscal year | 4 | | 4 | | 0 |
Financing receivable, originated two fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated three fiscal years before latest fiscal year | 0 | | 0 | | 36 |
Financing receivable, originated four fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated, revolving | 0 | | 0 | | 765 |
Financing receivable, originated | 4 | | 4 | | 801 |
Consumer Portfolio Segment [Member] | Loans and Finance Receivables [Member] | | | | | |
Financing receivable, originated in current fiscal year | 1,267 | | 1,267 | | 1,317 |
Financing receivable, originated in fiscal year before latest fiscal year | 952 | | 952 | | 688 |
Financing receivable, originated two fiscal years before latest fiscal year | 432 | | 432 | | 275 |
Financing receivable, originated three fiscal years before latest fiscal year | 152 | | 152 | | 122 |
Financing receivable, originated four fiscal years before latest fiscal year | 107 | | 107 | | 348 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 350 | | 350 | | 176 |
Financing receivable, originated, revolving | 2,711 | | 2,711 | | 3,010 |
Financing receivable, originated | 5,971 | | 5,971 | | 5,936 |
Year-to-date gross charge-offs | | | 62 | | 46 |
Fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Second fiscal year before current fiscal year period gross writeoffs | | | 16 | | 0 |
Third fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Fourth fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Fifth and prior fiscal year before current fiscal year period gross writeoffs | | | 0 | | 0 |
Current period gross writeoffs, revolving | | | 0 | | 0 |
Current period gross writeoffs, originated | 13 | $ 15 | 78 | $ 37 | 46 |
Consumer Portfolio Segment [Member] | Pass [Member] | Loans and Finance Receivables [Member] | | | | | |
Financing receivable, originated in current fiscal year | 1,203 | | 1,203 | | 1,317 |
Financing receivable, originated in fiscal year before latest fiscal year | 952 | | 952 | | 688 |
Financing receivable, originated two fiscal years before latest fiscal year | 432 | | 432 | | 275 |
Financing receivable, originated three fiscal years before latest fiscal year | 152 | | 152 | | 122 |
Financing receivable, originated four fiscal years before latest fiscal year | 107 | | 107 | | 348 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 350 | | 350 | | 176 |
Financing receivable, originated, revolving | 2,711 | | 2,711 | | 3,010 |
Financing receivable, originated | 5,907 | | 5,907 | | 5,936 |
Consumer Portfolio Segment [Member] | Special Mention [Member] | Loans and Finance Receivables [Member] | | | | | |
Financing receivable, originated in current fiscal year | 64 | | 64 | | 0 |
Financing receivable, originated in fiscal year before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated two fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated three fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated four fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated, revolving | 0 | | 0 | | 0 |
Financing receivable, originated | 64 | | 64 | | 0 |
Consumer Portfolio Segment [Member] | Substandard [Member] | Loans and Finance Receivables [Member] | | | | | |
Financing receivable, originated in current fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated in fiscal year before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated two fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated three fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated four fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated five and prior fiscal years before latest fiscal year | 0 | | 0 | | 0 |
Financing receivable, originated, revolving | 0 | | 0 | | 0 |
Financing receivable, originated | $ 0 | | $ 0 | | $ 0 |