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Note 2 - Mergers and Acquisitions - Consideration Paid and Goodwill (Details) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2018 | Jun. 29, 2018 | Oct. 01, 2017 | Aug. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
ASSETS |  |  |  |  |  |  |  |  |
Cash and due from banks |  |  |  |  |  | $ 4,650,731 | $ 4,434,511 | $ 10,094,645 |
Interest-bearing deposits at financial institutions |  |  |  |  |  | 62,924,396 | 3,953,907 | 14,730,157 |
Securities |  |  |  |  |  | 4,845,441 | 49,703,419 | 102,640,029 |
Loans/leases receivable, net |  |  |  |  |  | 477,336,699 | 192,517,677 | 419,029,277 |
Bank-owned life insurance |  |  |  |  |  | 7,091,883 |  |  |
Premises and equipment |  |  |  |  |  | 6,091,978 | 4,808,343 | 20,684,880 |
Restricted investment securities |  |  |  |  |  | 3,654,200 | 476,500 | 1,512,900 |
Core deposit intangible |  |  |  |  |  | 10,063,660 | 2,698,301 | 6,352,653 |
Other assets |  |  |  |  |  | 2,254,778 | 997,810 | 5,283,937 |
Total assets acquired |  |  |  |  |  | 578,913,766 | 259,590,468 | 581,676,478 |
Federal funds sold |  |  |  |  |  |  |  | 698,000 |
Other real estate owned |  |  |  |  |  |  |  | 650,000 |
LIABILITIES |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  | 439,579,328 | 212,467,514 | 486,298,262 |
Short-term borrowings |  |  |  |  |  | 1,143,478 | 13,102,043 |  |
FHLB advances |  |  |  |  |  | 74,539,463 | 4,108,027 | 20,368,877 |
Other borrowings |  |  |  |  |  | 9,543,810 |  |  |
Junior subordinated debentures |  |  |  |  |  |  | 3,857,275 |  |
Other liabilities |  |  |  |  |  | 8,877,991 | 2,595,883 | 4,897,564 |
Total liabilities assumed |  |  |  |  |  | 533,684,070 | 236,130,742 | 511,564,703 |
Net assets acquired |  |  |  |  |  | 45,229,696 | 23,459,726 | 70,111,775 |
Consideration paid: |  |  |  |  |  |  |  |  |
Cash | [1] |  |  |  |  | 9,833,535 | 7,803,420 | 80,000,000 |
Common stock |  |  |  |  |  | 81,637,166 | 30,879,485 |  |
Total consideration paid |  |  |  |  |  | 94,970,701 | 38,682,905 | 80,000,000 |
Goodwill |  |  |  |  |  | 77,831,902 | $ 28,334,092 | $ 13,110,913 | $ 3,222,688
Guaranty Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
Cash and due from banks |  |  |  | $ 4,434,511 |  |  |  |  |
Interest-bearing deposits at financial institutions |  |  |  | 3,953,907 |  |  |  |  |
Securities |  |  |  | 49,703,419 |  |  |  |  |
Loans/leases receivable, net |  |  |  | 192,517,677 |  |  |  |  |
Premises and equipment |  |  |  | 4,808,343 |  |  |  |  |
Restricted investment securities |  |  |  | 476,500 |  |  |  |  |
Core deposit intangible |  |  |  | 2,698,301 |  |  |  |  |
Other assets |  |  |  | 997,810 |  |  |  |  |
Total assets acquired |  |  |  | 259,590,468 |  |  |  |  |
LIABILITIES |  |  |  |  |  |  |  |  |
Deposits |  |  |  | 212,467,514 |  |  |  |  |
Short-term borrowings |  |  |  | 13,102,043 |  |  |  |  |
FHLB advances |  |  |  | 4,108,027 |  |  |  |  |
Junior subordinated debentures |  |  |  | 3,857,275 |  |  |  |  |
Other liabilities |  |  |  | 2,595,883 |  |  |  |  |
Total liabilities assumed |  |  |  | 236,130,742 |  |  |  |  |
Net assets acquired |  |  |  | 23,459,726 |  |  |  |  |
Consideration paid: |  |  |  |  |  |  |  |  |
Cash |  |  |  | 7,803,420 |  |  |  |  |
Common stock |  |  |  | 30,879,485 |  |  |  |  |
Total consideration paid |  |  |  | 38,682,905 |  |  |  |  |
Goodwill |  |  |  | $ 15,223,179 |  |  |  |  |
Community State Bank [Member] |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
Cash and due from banks |  |  |  |  | $ 10,094,645 |  |  |  |
Interest-bearing deposits at financial institutions |  |  |  |  | 14,730,157 |  |  |  |
Securities |  |  |  |  | 102,640,029 |  |  |  |
Loans/leases receivable, net |  |  |  |  | 419,029,277 |  |  |  |
Premises and equipment |  |  |  |  | 20,684,880 | 20,700,000 |  |  |
Restricted investment securities |  |  |  |  | 1,512,900 |  |  |  |
Core deposit intangible |  |  |  |  | 6,352,653 |  |  |  |
Other assets |  |  |  |  | 5,283,937 |  |  |  |
Total assets acquired |  |  |  |  | 581,676,478 |  |  |  |
Federal funds sold |  |  |  |  | 698,000 |  |  |  |
Other real estate owned |  |  |  |  | 650,000 |  |  |  |
LIABILITIES |  |  |  |  |  |  |  |  |
Deposits |  |  |  |  | 486,298,262 |  |  |  |
FHLB advances |  |  |  |  | 20,368,877 |  |  |  |
Other liabilities |  |  |  |  | 4,897,564 |  |  |  |
Total liabilities assumed |  |  |  |  | 511,564,703 |  |  |  |
Net assets acquired |  |  |  |  | 70,111,775 |  |  |  |
Consideration paid: |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | 80,000,000 | 69,905,355 |  |  |
Total consideration paid |  |  |  |  | 80,000,000 |  |  |  |
Goodwill |  |  |  |  | $ 9,888,225 |  |  |  |
Springfield Bancshares |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ 4,586,326 |  |  |  |  |  |  |
Interest-bearing deposits at financial institutions |  | 62,924,396 |  |  |  |  |  |  |
Securities |  | 4,845,441 |  |  |  |  |  |  |
Loans/leases receivable, net |  | 477,336,699 |  |  |  |  |  |  |
Bank-owned life insurance |  | 7,091,883 |  |  |  |  |  |  |
Premises and equipment |  | 6,091,978 |  |  |  |  |  |  |
Restricted investment securities |  | 3,654,200 |  |  |  |  |  |  |
Core deposit intangible |  | 8,208,728 |  |  |  |  |  |  |
Other assets |  | 1,470,689 |  |  |  |  |  |  |
Total assets acquired |  | 576,210,340 |  |  |  |  |  |  |
LIABILITIES |  |  |  |  |  |  |  |  |
Deposits |  | 439,579,328 |  |  |  |  |  |  |
Short-term borrowings |  | 1,143,478 |  |  |  |  |  |  |
FHLB advances |  | 74,539,463 |  |  |  |  |  |  |
Other borrowings |  | 9,543,810 |  |  |  |  |  |  |
Other liabilities |  | 8,408,463 |  |  |  |  |  |  |
Total liabilities assumed |  | 533,214,542 |  |  |  |  |  |  |
Net assets acquired |  | 42,995,798 |  |  |  |  |  |  |
Consideration paid: |  |  |  |  |  |  |  |  |
Cash |  | 8,333,535 |  |  |  | $ 3,747,209 |  |  |
Common stock |  | 80,637,194 | $ 80,600,000 |  |  |  |  |  |
Total consideration paid |  | 88,970,729 |  |  |  |  |  |  |
Goodwill |  | $ 45,974,931 |  |  |  |  |  |  |
[1] | Net cash paid at closing totaled $1,435,595 for acquisition of the Bates Companies in 2018. Net cash paid at closing totaled $3,747,209 for merger with Springfield Bancshares in 2018. Net cash paid at closing totaled $3,368,909 for acquisition of Guaranty Bank in 2017. Net cash paid at closing totaled $69,905,355 for acquisition of CSB in 2016.

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