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Note 6 - Goodwill and Intangibles - Core Deposit Intangibles (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance at the beginning of period | $ 9,078,953 | $ 7,381,213 |  |  |  |
Amortization expense | (1,692,431) | (1,000,561) | $ (442,850) |  |  |
Balance at the end of the period | 17,450,182 | 9,078,953 | 7,381,213 |  |  |
Net book value | 9,078,953 | 7,381,213 | 7,381,213 | $ 17,450,182 | $ 9,078,953 | $ 7,381,213
Core Deposits [Member] |  |  |  |  |  |
Balance at the beginning of period | 9,078,953 | 7,381,213 | 1,471,409 |  |  |
Amortization expense | (1,692,431) | (1,000,561) | (442,849) |  |  |
Balance at the end of the period | 15,595,250 | 9,078,953 | 7,381,213 |  |  |
Gross carrying amount |  |  |  | 19,254,809 | 11,046,081 | 8,347,780
Accumulated amortization |  |  |  | (3,659,559) | (1,967,128) | (966,567)
Net book value | 9,078,953 | 7,381,213 | 1,471,409 | $ 15,595,250 | $ 9,078,953 | $ 7,381,213
Core Deposits [Member] | Springfield Bancshares |  |  |  |  |  |
Core deposit intangible from acquisition | $ 8,208,728 |  |  |  |  |
Core Deposits [Member] | Guaranty Bank [Member] |  |  |  |  |  |
Core deposit intangible from acquisition |  | $ 2,698,301 |  |  |  |
Core Deposits [Member] | Community State Bank [Member] |  |  |  |  |  |
Core deposit intangible from acquisition |  |  | $ 6,352,653 |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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