Note 9 - Retirement Plans and Postretirement Benefit Plans (Details Textual) - USD ($)
|
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2002 |
Dec. 31, 1992 |
| Defined Contribution Plan, Percent of Employer Match, Aggregate |
|
|
|
4.00%
|
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| Defined Contribution Plan, Employee Deferral Required to be Eligible |
|
|
|
5.00%
|
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| Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount |
$ 24,000
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|
|
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| Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |
100.00%
|
100.00%
|
100.00%
|
|
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| Defined Contribution Plan, Employer Matching Contribution, Percent of Match |
3.00%
|
3.00%
|
3.00%
|
|
|
| Defined Contribution Plan, Administrative Expenses |
$ 512,000
|
$ 558,000
|
$ 558,000
|
|
|
| Defined Benefit Plan, Benefits Paid |
$ 205,000
|
$ 144,000
|
201,000
|
|
|
| Percentage of Debt Insurance Premium |
|
|
|
|
200.00%
|
| Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |
4.25%
|
4.25%
|
|
|
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| Percentage of Banks Expenses |
|
|
|
|
200.00%
|
| Defined Contribution Plan, Employer Discretionary Contribution Amount |
$ 0
|
$ 0
|
$ 0
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| Director [Member] |
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|
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| Defined Contribution Plan, Number of Employees Covered |
5
|
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| Retired Director [Member] |
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|
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| Defined Contribution Plan, Number of Employees Covered |
5
|
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| Executive Officer [Member] |
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|
|
|
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| Defined Contribution Plan, Number of Employees Covered |
10
|
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| Retired Executive Officer [Member] |
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|
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| Defined Contribution Plan, Number of Employees Covered |
12
|
|
|
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| For Director Service of Less Than 3 Years [Member] |
|
|
|
|
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| Defined Benefit Plan, Benefits Paid |
$ 500,000
|
|
|
|
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| For Director Service up to 5 Years [Member] |
|
|
|
|
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| Defined Benefit Plan, Benefits Paid |
600,000
|
|
|
|
|
| For Director Service up to 10 Years [Member] |
|
|
|
|
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| Defined Benefit Plan, Benefits Paid |
750,000
|
|
|
|
|
| For Director Service of 10 Years or More [Member] |
|
|
|
|
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| Defined Benefit Plan, Benefits Paid |
$ 1,000,000
|
|
|
|
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| Additional Matching Amount [Member] |
|
|
|
|
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| Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |
50.00%
|
50.00%
|
50.00%
|
|
|
| Defined Contribution Plan, Employer Matching Contribution, Percent of Match |
2.00%
|
2.00%
|
2.00%
|
|
|
| Minimum [Member] |
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|
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| Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |
1.00%
|
|
|
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| Maximum [Member] |
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|
|
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| Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |
75.00%
|
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