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Note 17 - Components of Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Net Unrealized Gain (Loss) on Securities |  |  | Adjustments Related to Pension Benefits |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at December 31, 201 4 |  | $ | (1,582 | ) |  | $ | (4,090 | ) |  | $ | (5,672 | )
Unrealized holding loss on available for sale securities net of tax of ($571) |  |  | (1,064 | ) |  |  | --- |  |  |  | (1,064 | )
Reclassification adjustment, net of tax of ($1 2) |  |  | (21 | ) |  |  | --- |  |  |  | (21 | )
Net pension loss arising during the period, net of tax of ($597) |  |  | --- |  |  |  | (1,108 | ) |  |  | (1,108 | )
Less amortization of prior service cost included in net periodic pensi on cost, net of tax of ($38) |  |  | --- |  |  |  | (72 | ) |  |  | (72 | )
Balance at December 31, 201 5 |  | $ | (2,667 | ) |  | $ | (5,270 | ) |  | $ | (7,937 | )
Unrealized holding loss on available for sa le securities net of tax of ($431) |  |  | (800 | ) |  |  | --- |  |  |  | (800 | )
Reclassification adjustment, net of tax of ($65) |  |  | (121 | ) |  |  | --- |  |  |  | (121 | )
Net pension gain arising during the period, net of tax of $132 |  |  | --- |  |  |  | 271 |  |  |  | 271 |
Less amortization of prior service cost included in net periodic pension cost, net of tax of ($38) |  |  | --- |  |  |  | (72 | ) |  |  | (72 | )
Balance at December 31, 201 6 |  | $ | (3,588 | ) |  | $ | (5,071 | ) |  | $ | (8,659 | )
Unrealized holding gain on available for sale securities net of tax of $296 |  |  | 546 |  |  |  | --- |  |  |  | 546 |
Reclassification a djustment, net of tax of ($4) |  |  | (6 | ) |  |  | --- |  |  |  | (6 | )
Net pension gain arising during the period, net of tax of $115 |  |  | --- |  |  |  | 213 |  |  |  | 213 |
Less amortization of prior service cost included in net periodic pension cost, net of tax of ($38) |  |  | --- |  |  |  | (71 | ) |  |  | (71 | )
Reclassification of stranded tax effects from change in tax rate |  |  | (656 | ) |  |  | (1,062 | ) |  |  | (1,718 | )
Balance at December 31, 201 7 |  | $ | (3,704 | ) |  | $ | (5,991 | ) |  | $ | (9,695 | )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
|  | December 31, |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Component of Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |
Reclassification out of unrealized gains and losses on available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
Realized securities gain, net |  | $ | (10 | ) |  | $ | (186 | ) |  | $ | (33 | )
Income tax benefit |  |  | (4 | ) |  |  | (65 | ) |  |  | (12 | )
Realized gain on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive income (loss) |  | $ | (6 | ) |  | $ | (121 | ) |  | $ | (21 | )
Amortization of defined benefit pension items: |  |  |  |  |  |  |  |  |  |  |  |
Pr ior service costs (1) |  | $ | (109 | ) |  | $ | (110 | ) |  | $ | (110 | )
Income tax benefit |  |  | (38 | ) |  |  | (38 | ) |  |  | (38 | )
Amortization of defined benefit pension items , net of tax, reclassified out of accumulated other comprehensive income (loss) |  | $ | (71 | ) |  | $ | (72 | ) |  | $ | (72 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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