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Note 3 - Investment Securities Available for Sale (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | December 31, 2017 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(Dollar amounts in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. government agency securities |  | $ | 8,664 |  |  | $ | 126 |  |  | $ | (71 | ) |  | $ | 8,719 |
Obligations of states and political subdivisions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 504 |  |  |  | 8 |  |  |  | - |  |  |  | 512 |
Tax-exempt |  |  | 65,408 |  |  |  | 1,547 |  |  |  | (38 | ) |  |  | 66,917 |
Mortgage-backed securities in government-sponsored entities |  |  | 18,640 |  |  |  | 157 |  |  |  | (287 | ) |  |  | 18,510 |
Total debt securities |  |  | 93,216 |  |  |  | 1,838 |  |  |  | (396 | ) |  |  | 94,658 |
Equity securities in financial institutions |  |  | 415 |  |  |  | 210 |  |  |  | - |  |  |  | 625 |
Total |  | $ | 93,631 |  |  | $ | 2,048 |  |  | $ | (396 | ) |  | $ | 95,283 |
|  | December 31, 2016 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(Dollar amounts in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. government agency securities |  | $ | 10,158 |  |  | $ | 174 |  |  | $ | (96 | ) |  | $ | 10,236 |
Obligations of states and political subdivisions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 1,615 |  |  |  | 129 |  |  |  | (4 | ) |  |  | 1,740 |
Tax-exempt |  |  | 78,327 |  |  |  | 1,678 |  |  |  | (522 | ) |  |  | 79,483 |
Mortgage-backed securities in government-sponsored entities |  |  | 20,128 |  |  |  | 202 |  |  |  | (261 | ) |  |  | 20,069 |
Private-label mortgage-backed securities |  |  | 1,579 |  |  |  | 130 |  |  |  | - |  |  |  | 1,709 |
Total debt securities |  |  | 111,807 |  |  |  | 2,313 |  |  |  | (883 | ) |  |  | 113,237 |
Equity securities in financial institutions |  |  | 750 |  |  |  | 389 |  |  |  | - |  |  |  | 1,139 |
Total |  | $ | 112,557 |  |  | $ | 2,702 |  |  | $ | (883 | ) |  | $ | 114,376 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized |  |  | Fair |
(Dollar amounts in thousands) |  | Cost |  |  | Value |
Due in one year or less |  | $ | 2,340 |  |  | $ | 2,377 |
Due after one year through five years |  |  | 9,718 |  |  |  | 9,878 |
Due after five years through ten years |  |  | 10,992 |  |  |  | 11,012 |
Due after ten years |  |  | 70,166 |  |  |  | 71,391 |
Total |  | $ | 93,216 |  |  | $ | 94,658 |
Realized Gain (Loss) on Investments [Table Text Block] |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Proceeds from sales |  | $ | 6,474 |  |  | $ | 9,063 |  |  | $ | 15,686 |
Gross realized gains |  |  | 911 |  | * |  | 309 |  |  |  | 440 |
Gross realized losses |  |  | (25 | ) |  |  | (6 | ) |  |  | (117 | )
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | December 31, 2017 |
|  | Less than Twelve Months |  |  | Twelve Months or Greater |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(Dollar amounts in thousands) |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S. government agency securities |  | $ | 557 |  |  | $ | (4 | ) |  | $ | 4,036 |  |  | $ | (67 | ) |  | $ | 4,593 |  |  | $ | (71 | )
Obligations of states and political subdivisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 1,009 |  |  |  | (6 | ) |  |  | 2,784 |  |  |  | (32 | ) |  |  | 3,793 |  |  |  | (38 | )
Mortgage-backed securities in government-sponsored entities |  |  | 5,698 |  |  |  | (71 | ) |  |  | 8,734 |  |  |  | (216 | ) |  |  | 14,432 |  |  |  | (287 | )
Total |  | $ | 7,264 |  |  | $ | (81 | ) |  | $ | 15,554 |  |  | $ | (315 | ) |  | $ | 22,818 |  |  | $ | (396 | )
|  | December 31, 2016 |
|  | Less than Twelve Months |  |  | Twelve Months or Greater |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(Dollar amounts in thousands) |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S. government agency securities |  | $ | 3,803 |  |  | $ | (47 | ) |  | $ | 1,316 |  |  | $ | (49 | ) |  | $ | 5,119 |  |  | $ | (96 | )
Obligations of states and political subdivisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 502 |  |  |  | (4 | ) |  |  | - |  |  |  | - |  |  |  | 502 |  |  |  | (4 | )
Tax-exempt |  |  | 23,554 |  |  |  | (522 | ) |  |  | - |  |  |  | - |  |  |  | 23,554 |  |  |  | (522 | )
Mortgage-backed securities in government-sponsored entities |  |  | 9,066 |  |  |  | (126 | ) |  |  | 4,438 |  |  |  | (135 | ) |  |  | 13,504 |  |  |  | (261 | )
Total |  | $ | 36,925 |  |  | $ | (699 | ) |  | $ | 5,754 |  |  | $ | (184 | ) |  | $ | 42,679 |  |  | $ | (883 | )

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