Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands |
12 Months Ended |
156 Months Ended |
|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2004 |
Dec. 31, 2000 |
Dec. 31, 1997 |
Dec. 31, 2016 |
Dec. 31, 2013 |
| Number of Operating Segments |
1
|
|
|
|
|
|
|
|
| Number of Reportable Segments |
1
|
|
|
|
|
|
|
|
| Federal Home Loan Bank Stock and Federal Reserve Bank Stock |
$ 9,800
|
$ 9,400
|
|
|
|
|
$ 9,800
|
|
| Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums |
$ 301
|
$ 285
|
|
|
|
|
$ 301
|
|
| Net Deferred Loan Costs, Percent of Average Loans Outstanding |
0.03%
|
0.30%
|
|
|
|
|
0.03%
|
|
| Interest Receivable, Percent of Average Loans Outstanding |
0.30%
|
0.30%
|
|
|
|
|
0.30%
|
|
| Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage |
$ 1,700
|
$ 715
|
|
|
|
|
$ 1,700
|
|
| Mortgage Banking Revenues, Percent of Total Revenue |
1.60%
|
1.60%
|
1.10%
|
|
|
|
|
|
| Servicing Asset at Fair Value, Amount |
$ 731
|
$ 691
|
|
|
|
|
731
|
|
| Mortgage Loans Serviced for Others |
202,000
|
200,000
|
|
|
|
|
202,000
|
|
| Cash Reserve Deposit Required and Made |
$ 18,000
|
$ 18,000
|
|
|
|
|
$ 18,000
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |
85.00%
|
|
|
|
|
|
|
|
| Stock Issued During Period, Shares, Employee Stock Purchase Plans |
6,631
|
6,329
|
6,894
|
|
|
|
|
|
| Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition |
$ 32
|
$ 31
|
$ 32
|
|
|
|
|
|
| Trading Securities |
|
0
|
0
|
|
|
|
|
$ 0
|
| Other than Temporary Impairment Losses, Investments |
0
|
0
|
$ 0
|
|
|
|
|
|
| Servicing Asset at Amortized Cost, Other than Temporary Impairments |
$ 0
|
$ 0
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |
0
|
0
|
0
|
|
|
|
0
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |
0
|
0
|
0
|
40,049
|
54,000
|
450,000
|
0
|
|
| Treasury Stock, Shares, Acquired |
0
|
0
|
|
|
|
|
|
|
| Minimum [Member] |
|
|
|
|
|
|
|
|
| Finite-Lived Intangible Asset, Useful Life |
7 years
|
|
|
|
|
|
|
|
| Minimum [Member] | Furniture and Fixtures [Member] |
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life |
2 years
|
|
|
|
|
|
|
|
| Minimum [Member] | Building and Building Improvements [Member] |
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life |
10 years
|
|
|
|
|
|
|
|
| Maximum [Member] |
|
|
|
|
|
|
|
|
| Finite-Lived Intangible Asset, Useful Life |
10 years
|
|
|
|
|
|
|
|
| Maximum [Member] | Furniture and Fixtures [Member] |
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life |
7 years
|
|
|
|
|
|
|
|
| Maximum [Member] | Building and Building Improvements [Member] |
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life |
40 years
|
|
|
|
|
|
|
|
| Loans Receivable [Member] |
|
|
|
|
|
|
|
|
| Interest Receivable |
$ 2,800
|
$ 2,900
|
|
|
|
|
$ 2,800
|
|