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Note 4 - Loans Receivable - Allowance for Loan Losses and Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Allowance for loan losses, individually evaluated for impairment | $ 28 |  | $ 28 |  |  |
Allowance for loan losses, collectively evaluated for impairment | 6,867 |  | 7,723 |  |  |
Allowance for loan losses | 6,895 | $ 6,857 | 7,751 | $ 8,011 | $ 8,156 | $ 7,632
Loan balances, individually evaluated for impairment | 2,162 |  | 2,534 |  |  |
Loan balances, collectively evaluated for impairment | 1,051,734 |  | 1,007,424 |  |  |
Loans receivable | 1,053,896 |  | 1,009,958 |  |  |
Net deferred loan origination costs | 55 |  | 371 |  |  |
Allowance for loan losses | (6,895) | (6,857) | (7,751) | (8,011) | (8,156) | (7,632)
Loans receivable, net of allowance for loan losses: September 30, 2021, $6,895 and December 31, 2020, $7,751 | 1,047,056 |  | 1,002,578 |  |  |
Allowance for loan losses | 6,895 | 6,857 | 7,751 | 8,011 | 8,156 | 7,632
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member] |  |  |  |  |  |
Allowance for loan losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Allowance for loan losses, collectively evaluated for impairment | 401 |  | 518 |  |  |
Allowance for loan losses | 401 | 396 | 518 | 623 | 665 | 675
Loan balances, individually evaluated for impairment | 1,354 |  | 1,718 |  |  |
Loan balances, collectively evaluated for impairment | 30,475 |  | 39,973 |  |  |
Loans receivable | 31,829 |  | 41,691 |  |  |
Allowance for loan losses | (401) | (396) | (518) | (623) | (665) | (675)
Allowance for loan losses | 401 | 396 | 518 | 623 | 665 | 675
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] |  |  |  |  |  |
Allowance for loan losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Allowance for loan losses, collectively evaluated for impairment | 3,579 |  | 4,062 |  |  |
Allowance for loan losses | 3,579 | 3,690 | 4,062 | 4,143 | 4,185 | 3,676
Loan balances, individually evaluated for impairment | 503 |  | 520 |  |  |
Loan balances, collectively evaluated for impairment | 435,131 |  | 451,721 |  |  |
Loans receivable | 435,634 |  | 452,241 |  |  |
Allowance for loan losses | (3,579) | (3,690) | (4,062) | (4,143) | (4,185) | (3,676)
Allowance for loan losses | 3,579 | 3,690 | 4,062 | 4,143 | 4,185 | 3,676
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] |  |  |  |  |  |
Allowance for loan losses, individually evaluated for impairment | 28 |  | 28 |  |  |
Allowance for loan losses, collectively evaluated for impairment | 1,278 |  | 1,541 |  |  |
Allowance for loan losses | 1,306 | 1,336 | 1,569 | 1,717 | 1,602 | 1,176
Loan balances, individually evaluated for impairment | 296 |  | 296 |  |  |
Loan balances, collectively evaluated for impairment | 100,173 |  | 108,362 |  |  |
Loans receivable | 100,469 |  | 108,658 |  |  |
Allowance for loan losses | (1,306) | (1,336) | (1,569) | (1,717) | (1,602) | (1,176)
Allowance for loan losses | 1,306 | 1,336 | 1,569 | 1,717 | 1,602 | 1,176
Construction and Land Loans [Member] |  |  |  |  |  |
Allowance for loan losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Allowance for loan losses, collectively evaluated for impairment | 12 |  | 12 |  |  |
Allowance for loan losses | 12 |  | 12 |  |  |
Loan balances, individually evaluated for impairment | 0 |  | 0 |  |  |
Loan balances, collectively evaluated for impairment | 499 |  | 499 |  |  |
Loans receivable | 499 |  | 499 |  |  |
Allowance for loan losses | (12) |  | (12) |  |  |
Allowance for loan losses | 12 |  | 12 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Allowance for loan losses, collectively evaluated for impairment | 1,554 |  | 1,536 |  |  |
Allowance for loan losses | 1,554 | 1,377 | 1,536 | 1,480 | 1,658 | 2,065
Loan balances, individually evaluated for impairment | 9 |  | 0 |  |  |
Loan balances, collectively evaluated for impairment | 483,696 |  | 405,057 |  |  |
Loans receivable | 483,705 |  | 405,057 |  |  |
Allowance for loan losses | (1,554) | (1,377) | (1,536) | (1,480) | (1,658) | (2,065)
Allowance for loan losses | 1,554 | 1,377 | 1,536 | 1,480 | 1,658 | 2,065
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Allowance for loan losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Allowance for loan losses, collectively evaluated for impairment | 43 |  | 54 |  |  |
Allowance for loan losses | 43 | 47 | 54 | 48 | 46 | 40
Loan balances, individually evaluated for impairment | 0 |  | 0 |  |  |
Loan balances, collectively evaluated for impairment | 1,760 |  | 1,812 |  |  |
Loans receivable | 1,760 |  | 1,812 |  |  |
Allowance for loan losses | (43) | (47) | (54) | (48) | (46) | (40)
Allowance for loan losses | $ 43 | $ 47 | $ 54 | $ 48 | $ 46 | $ 40

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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