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Note 7 - Debt and Equity Securities (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
2020: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 9,393 |  |  | $ | 378 |  |  | $ | - |  |  | $ | 9,771 |
U.S. government agencies |  |  | 109,659 |  |  |  | 3,886 |  |  |  | (62 | ) |  |  | 113,483 |
U.S. government mortgage-backed securities |  |  | 82,826 |  |  |  | 3,165 |  |  |  | (6 | ) |  |  | 85,985 |
State and political subdivisions |  |  | 207,276 |  |  |  | 788 |  |  |  | (2,306 | ) |  |  | 205,758 |
Corporate bonds |  |  | 74,179 |  |  |  | 1,075 |  |  |  | (947 | ) |  |  | 74,307 |
|  | $ | 483,333 |  |  | $ | 9,292 |  |  | $ | (3,321 | ) |  | $ | 489,304 |
2019: |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
U.S. government treasuries |  | $ | 9,392 |  |  | $ | 64 |  |  | $ | (4 | ) |  | $ | 9,452 |
U.S. government agencies |  |  | 124,913 |  |  |  | 1,609 |  |  |  | (89 | ) |  |  | 126,433 |
U.S. government mortgage-backed securities |  |  | 80,295 |  |  |  | 867 |  |  |  | (34 | ) |  |  | 81,128 |
State and political subdivisions |  |  | 193,745 |  |  |  | 1,852 |  |  |  | (295 | ) |  |  | 195,302 |
Corporate bonds |  |  | 66,012 |  |  |  | 1,542 |  |  |  | (26 | ) |  |  | 67,528 |
|  | $ | 474,357 |  |  | $ | 5,934 |  |  | $ | (448 | ) |  | $ | 479,843 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 64,579 |  |  | $ | 64,569 |
Due after one year through five years |  |  | 243,384 |  |  |  | 248,125 |
Due after five years through ten years |  |  | 138,192 |  |  |  | 140,093 |
Due after ten years |  |  | 37,178 |  |  |  | 36,517 |
Total |  | $ | 483,333 |  |  | $ | 489,304 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three Months Ended |
|  | March 31, |
|  | 2020 |  |  | 2019 |
Proceeds from sales of securities available-for-sale |  | $ | 3,385 |  |  | $ | - |
Gross realized gains on securities available-for-sale |  |  | 386 |  |  |  | - |
Gross realized losses on securities available-for-sale |  |  | - |  |  |  | - |
Tax provision applicable to net realized gains on securities available-for-sale |  |  | 97 |  |  |  | - |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
2020: |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
U.S. government agencies |  |  | 3,921 |  |  |  | (62 | ) |  |  | - |  |  |  | - |  |  |  | 3,921 |  |  |  | (62 | )
U.S. government mortgage-backed securities |  |  | - |  |  |  | - |  |  |  | 1,734 |  |  |  | (6 | ) |  |  | 1,734 |  |  |  | (6 | )
State and political subdivisions |  |  | 106,027 |  |  |  | (2,298 | ) |  |  | 176 |  |  |  | (8 | ) |  |  | 106,203 |  |  |  | (2,306 | )
Corporate bonds |  |  | 37,547 |  |  |  | (947 | ) |  |  | - |  |  |  | - |  |  |  | 37,547 |  |  |  | (947 | )
|  | $ | 147,495 |  |  | $ | (3,307 | ) |  | $ | 1,910 |  |  | $ | (14 | ) |  | $ | 149,405 |  |  | $ | (3,321 | )
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
2019: |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government treasuries |  | $ | 3,023 |  |  | $ | (4 | ) |  | $ | - |  |  | $ | - |  |  | $ | 3,023 |  |  | $ | (4 | )
U.S. government agencies |  |  | 23,827 |  |  |  | (85 | ) |  |  | 2,520 |  |  |  | (4 | ) |  |  | 26,347 |  |  |  | (89 | )
U.S. government mortgage-backed securities |  |  | 14,885 |  |  |  | (28 | ) |  |  | 1,934 |  |  |  | (6 | ) |  |  | 16,819 |  |  |  | (34 | )
State and political subdivisions |  |  | 17,512 |  |  |  | (125 | ) |  |  | 5,954 |  |  |  | (170 | ) |  |  | 23,466 |  |  |  | (295 | )
Corporate bonds |  |  | 4,129 |  |  |  | (26 | ) |  |  | - |  |  |  | - |  |  |  | 4,129 |  |  |  | (26 | )
|  | $ | 63,376 |  |  | $ | (268 | ) |  | $ | 10,408 |  |  | $ | (180 | ) |  | $ | 73,784 |  |  | $ | (448 | )

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