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Note 10 - Regulatory and Operational Matters - Regulatory Capital Amounts and Ratios (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio |  | 10.00% |
Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio |  | 8.00% |
Common Equity Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio |  | 6.50% |
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio |  | 5.00% |
Parent Company [Member] |  |  |
Total Capital (to Risk Weighted Assets) Actual Amount |  | $ 77,930 | $ 74,264
Total Capital (to Risk Weighted Assets) Actual Ratio |  | 9.575% | 10.092%
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | [1] |  |
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | [1] |  |
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Amount | [2] |  |
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Ratio | [2] |  |
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount |  | $ 65,108 | $ 58,868
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio |  | 8.00% | 8.00%
Tier 1 Capital (to Risk Weighted Assets) Actual Amount |  | $ 71,394 | $ 67,959
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio |  | 8.772% | 9.235%
Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | [1] |  |
Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | [1] |  |
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Amount | [2] |  |
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Ratio | [2] |  |
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount |  | $ 48,831 | $ 44,151
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio |  | 6.00% | 6.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Amount |  | $ 63,394 | $ 59,959
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio |  | 7.789% | 8.148%
Common Equity Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | [1] |  |
Common Equity Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | [1] |  |
Common Equity Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Amount | [2] |  |
Common Equity Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Ratio | [2] |  |
Common Equity Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount |  | $ 36,623 | $ 33,113
Common Equity Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio |  | 4.50% | 4.50%
Tier 1 Capital (to Average Assets) Actual Amount |  | $ 71,394 | $ 67,959
Tier 1 Capital (to Average Assets) Actual Ratio |  | 7.974% | 8.219%
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | [1] |  |
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | [1] |  |
Tier 1 Capital (to Average Assets) For Capital Adequacy Purposes Amount |  | $ 35,815 | $ 33,072
Tier 1 Capital (to Average Assets) For Capital Adequacy Purposes Ratio |  | 4.00% | 4.00%
Subsidiaries [Member] |  |  |
Total Capital (to Risk Weighted Assets) Actual Amount |  | $ 95,988 | $ 83,711
Total Capital (to Risk Weighted Assets) Actual Ratio |  | 11.852% | 11.406%
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | [1] | $ 80,987 | $ 73,393
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | [1] | 10.00% | 10.00%
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Amount | [2] | $ 79,975 | $ 67,889
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Ratio | [2] | 9.875% | 9.25%
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount |  | $ 64,790 | $ 58,715
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio |  | 8.00% | 8.00%
Tier 1 Capital (to Risk Weighted Assets) Actual Amount |  | $ 89,451 | $ 77,407
Tier 1 Capital (to Risk Weighted Assets) Actual Ratio |  | 11.045% | 10.547%
Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | [1] | $ 64,790 | $ 58,715
Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | [1] | 8.00% | 8.00%
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Amount | [2] | $ 63,777 | $ 53,210
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Ratio | [2] | 7.875% | 7.25%
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount |  | $ 48,592 | $ 44,036
Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio |  | 6.00% | 6.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Amount |  | $ 89,451 | $ 77,407
Common Equity Tier 1 Capital (to Risk Weighted Assets) Actual Ratio |  | 11.045% | 10.547%
Common Equity Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | [1] | $ 52,642 | $ 47,706
Common Equity Tier 1 Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | [1] | 6.50% | 6.50%
Common Equity Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Amount | [2] | $ 51,629 | $ 42,201
Common Equity Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes With Capital Buffer Ratio | [2] | 6.375% | 5.75%
Common Equity Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount |  | $ 36,444 | $ 33,027
Common Equity Tier 1 Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio |  | 4.50% | 4.50%
Tier 1 Capital (to Average Assets) Actual Amount |  | $ 89,451 | $ 77,407
Tier 1 Capital (to Average Assets) Actual Ratio |  | 10.029% | 9.36%
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | [1] | $ 44,598 | $ 41,351
Tier 1 Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | [1] | 5.00% | 5.00%
Tier 1 Capital (to Average Assets) For Capital Adequacy Purposes Amount |  | $ 35,679 | $ 33,081
Tier 1 Capital (to Average Assets) For Capital Adequacy Purposes Ratio |  | 4.00% | 4.00%
[1] | Designation as "Well Capitalized" does not apply to bank holding companies - - the Company. Such categorization of capital adequacy only applies to insured depository institutions - - the Bank.
[2] | The Capital Conservation Buffer implemented by the FDIC began to be phased in beginning January 1, 2016. It was not applicable to periods prior to that date and does not apply to bank holding companies - - the Company.

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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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