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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Beginning balance |  |  |  | $ 3,634 |  |  |  | $ 3,386 |  |  |  | $ 3,415 | $ 3,634 | $ 3,386 | $ 3,415 |  |
Provision for loan losses | $ 200 | $ 455 | $ 316 | 197 | $ 298 | $ 150 | $ 256 | 211 | $ 220 | $ 200 | $ 150 | 75 | 1,168 | 915 | 645 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (1,027) | (936) | (918) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 290 | 269 | 244 |  |
Ending balance | 4,065 |  |  |  | 3,634 |  |  |  | 3,386 |  |  |  | 4,065 | 3,634 | 3,386 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48 | $ 52
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,017 | 3,580
Acquired with deteriorated credit quality | 4,065 |  |  | 3,634 | 3,634 |  |  | 3,386 | 3,386 |  |  | 3,415 | 4,065 | 3,634 | 3,386 | 4,065 | 3,634
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,785 | 3,423
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 435,740 | 410,796
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 439,855 | 414,617
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |  |
Ending balance |  |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |
Acquired with deteriorated credit quality |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  | 2 |  |  | 2
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 330 | 398
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 219 |  |  |  | 380 |  |  |  | 527 | 219 | 380 | 527 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 723 | (120) | (87) |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (258) | (74) | (118) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 9 | 33 | 58 |  |
Ending balance | 693 |  |  |  | 219 |  |  |  | 380 |  |  |  | 693 | 219 | 380 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 35
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 690 | 182
Acquired with deteriorated credit quality | 693 |  |  | 219 | 219 |  |  | 380 | 380 |  |  | 527 | 219 | 219 | 380 | 693 | 219
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,184 | 2,907
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 134,553 | 133,703
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137,019 | 136,960
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |  |
Ending balance |  |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |
Acquired with deteriorated credit quality |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  | 2 |  |  | 2
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 282 | 350
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 133 |  |  |  | 56 |  |  |  | 157 | 133 | 56 | 157 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 29 | 77 | (92) |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | 162 |  |  |  | 133 |  |  |  | 56 |  |  |  | 162 | 133 | 56 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 162 | 133
Acquired with deteriorated credit quality | 162 |  |  | 133 | 133 |  |  | 56 | 56 |  |  | 157 | 133 | 133 | 56 | 162 | 133
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152 |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,592 | 18,309
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,744 | 18,309
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 245 |  |  |  | 80 |  |  |  | 47 | 245 | 80 | 47 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | (21) | 165 | 33 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | 224 |  |  |  | 245 |  |  |  | 80 |  |  |  | 224 | 245 | 80 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 224 | 245
Acquired with deteriorated credit quality | 224 |  |  | 245 | 245 |  |  | 80 | 80 |  |  | 47 | 245 | 245 | 80 | 224 | 245
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 521 |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,921 | 21,034
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,442 | 21,034
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,622 |  |  |  | 1,670 |  |  |  | 1,541 | 1,622 | 1,670 | 1,541 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | (296) | (124) | 157 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) | (82) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 75 | 79 | 54 |  |
Ending balance | 1,401 |  |  |  | 1,622 |  |  |  | 1,670 |  |  |  | 1,401 | 1,622 | 1,670 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44 |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,357 | 1,622
Acquired with deteriorated credit quality | 1,401 |  |  | 1,622 | 1,622 |  |  | 1,670 | 1,670 |  |  | 1,541 | 1,622 | 1,622 | 1,670 | 1,401 | 1,622
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 466 | 401
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 107,158 | 99,891
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 107,672 | 100,340
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 | 48
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 291 |  |  |  | 198 |  |  |  | 261 | 291 | 198 | 261 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 218 | 226 | 187 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (51) | (140) | (264) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 7 | 14 |  |
Ending balance | 459 |  |  |  | 291 |  |  |  | 198 |  |  |  | 459 | 291 | 198 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 4
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 458 | 287
Acquired with deteriorated credit quality | 459 |  |  | 291 | 291 |  |  | 198 | 198 |  |  | 261 | 291 | 291 | 198 | 459 | 291
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 427 | 42
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,990 | 34,161
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,417 | 34,203
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 710 |  |  |  | 683 |  |  |  | 626 | 710 | 683 | 626 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | (278) | 28 | 79 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (21) | (6) | (36) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 32 | 5 | 14 |  |
Ending balance | 443 |  |  |  | 710 |  |  |  | 683 |  |  |  | 443 | 710 | 683 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 443 | 697
Acquired with deteriorated credit quality | 443 |  |  | 710 | 710 |  |  | 683 | 683 |  |  | 626 | 710 | 710 | 683 | 443 | 710
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 | 73
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52,968 | 50,905
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,003 | 50,978
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 414 |  |  |  | 319 |  |  |  |  | 414 | 319 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 793 | 663 |  |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (697) | (713) |  |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 173 | 145 |  |  |
Ending balance | 683 |  |  |  | 414 |  |  |  | 319 |  |  |  | 683 | 414 | 319 |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 683 | 414
Acquired with deteriorated credit quality | 683 |  |  | 414 | 414 |  |  | 319 | 319 |  |  |  | 414 | 414 | 319 | 683 | 414
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,558 | 52,793
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,558 | 52,793
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  | 319 |  |  |  | 256 |  | 319 | 256 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 368 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (409) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 104 |  |
Ending balance |  |  |  |  |  |  |  |  | 319 |  |  |  |  |  | 319 |  |
Acquired with deteriorated credit quality |  |  |  |  |  |  |  | $ 319 | $ 319 |  |  | $ 256 |  | $ 319 | $ 256 |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57,558 | $ 52,793

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively 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=84173941&loc=SL6953423-111524 + Details
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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=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively 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 (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables 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 (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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