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Note 7 - Intangibles and Acquisition Related Accounting (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 24, 2019 | Jul. 26, 2018 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Goodwill, Ending Balance |  |  |  | $ 11,109 |  | $ 8,170
Goodwill, Impairment Loss |  |  |  | 0 |  |
AJS Bancorp, Inc [Member] |  |  |  |  |  |
Goodwill, Ending Balance | $ 2,939 |  |  | 2,900 |  |
Certificates of Deposit, Fair Value Premium | $ 174 |  |  |  |  |
Certificates of Deposit, Fair Value Premium, Amortization Period | 14 years |  |  |  |  |
Accretion (Amortization) of Discounts and Premiums, Investments |  |  |  | 102 |  |
AJS Bancorp, Inc [Member] | Forecast [Member] |  |  |  |  |  |
Accretion (Amortization) of Discounts and Premiums, Investments |  |  | $ 38 |  | $ 34 |
AJS Bancorp, Inc [Member] | Core Deposits [Member] |  |  |  |  |  |
Finite-Lived Core Deposits, Gross |  |  |  | $ 2,900 |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 6 years 182 days |  |
First Personal Financial Corporation [Member] |  |  |  |  |  |
Goodwill, Ending Balance |  | $ 5,437 |  | $ 5,400 |  |
Certificates of Deposit, Fair Value Premium |  | $ 133 |  |  |  |
Certificates of Deposit, Fair Value Premium, Amortization Period |  | 240 days |  |  |  |
Accretion (Amortization) of Discounts and Premiums, Investments |  |  |  | 53 |  |
First Personal Financial Corporation [Member] | Core Deposits [Member] |  |  |  |  |  |
Finite-Lived Core Deposits, Gross |  |  |  | $ 3,000 |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 6 years 146 days |  |
First Federal Savings and Loan [Member] |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  | $ 2,000 |  |
First Federal Savings and Loan [Member] | Core Deposits [Member] |  |  |  |  |  |
Finite-Lived Core Deposits, Gross |  |  |  | $ 93 |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 7 years 328 days |  |
Liberty Savings Bank [Member] |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  | $ 804 |  |
Liberty Savings Bank [Member] | Core Deposits [Member] |  |  |  |  |  |
Finite-Lived Core Deposits, Gross |  |  |  | $ 471 |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 8 years 73 days |  |

X
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- Definition Amortization period for the premium on certificates of deposit, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Bank deposits belonging to an acquired bank that can be counted on as a stable source of lending funds. These deposits have the following attributes: predictable costs and low sensitivity to interest rates. This intangible asset is usually amortized over its estimated useful life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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