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Note 2 - Mergers and Acquisitions - Purchased Loans As of the Acquisition Date (Details) - USD ($) | Jul. 01, 2018 | Oct. 01, 2017 | Aug. 31, 2016
--- | --- | --- | ---
Guaranty Bank and Trust Company [Member] |  |  |
Contractually required principal payments |  | $ 196,108,766 |
Nonaccretable discount |  | (1,147,198) |
Principal cash flows expected to be collected |  | 194,961,568 |
Accretable discount |  | (2,443,891) |
Fair Value of acquired loans |  | 192,517,677 |
Guaranty Bank and Trust Company [Member] | Performing Loans |  |  |
Contractually required principal payments |  | 192,982,439 |
Principal cash flows expected to be collected |  | 192,982,439 |
Accretable discount |  | (2,223,989) |
Fair Value of acquired loans |  | 190,758,450 |
Community State Bank [Member] |  |  |
Contractually required principal payments |  |  | $ 435,748,088
Nonaccretable discount |  |  | (4,525,223)
Principal cash flows expected to be collected |  |  | 431,222,865
Accretable discount |  |  | (12,193,588)
Fair Value of acquired loans |  |  | 419,029,277
Community State Bank [Member] | Performing Loans |  |  |
Contractually required principal payments |  |  | 427,398,400
Principal cash flows expected to be collected |  |  | 427,398,400
Accretable discount |  |  | (11,916,009)
Fair Value of acquired loans |  |  | 415,482,391
Springfield Bancshares |  |  |
Contractually required principal payments | $ 486,992,459 |  |
Nonaccretable discount | (1,562,455) |  |
Principal cash flows expected to be collected | 485,430,004 |  |
Accretable discount | (8,093,305) |  |
Fair Value of acquired loans | 477,336,699 |  |
Springfield Bancshares | Performing Loans |  |  |
Contractually required principal payments | 479,439,547 |  |
Principal cash flows expected to be collected | 479,439,547 |  |
Accretable discount | (7,799,860) |  |
Fair Value of acquired loans | 471,639,687 |  |
PCI Loans | Guaranty Bank and Trust Company [Member] |  |  |
Contractually required principal payments |  | 3,126,327 |
Nonaccretable discount |  | (1,147,198) |
Principal cash flows expected to be collected |  | 1,979,129 |
Accretable discount |  | (219,902) |
Fair Value of acquired loans |  | $ 1,759,227 |
PCI Loans | Community State Bank [Member] |  |  |
Contractually required principal payments |  |  | 8,349,688
Nonaccretable discount |  |  | (4,525,223)
Principal cash flows expected to be collected |  |  | 3,824,465
Accretable discount |  |  | (277,579)
Fair Value of acquired loans |  |  | $ 3,546,886
PCI Loans | Springfield Bancshares |  |  |
Contractually required principal payments | 7,552,912 |  |
Nonaccretable discount | (1,562,455) |  |
Principal cash flows expected to be collected | 5,990,457 |  |
Accretable discount | (293,445) |  |
Fair Value of acquired loans | $ 5,697,012 |  |

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- Definition Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- Definition Amount of cash flows expected to be collected at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount of contractually required payments receivable at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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