Note 3 - Investment Securities (Details Textual)
|
12 Months Ended |
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
| Proceeds from Sale of Available-for-sale Securities, Debt |
$ 1,495,000
|
|
|
| Proceeds from Sale and Maturity of Marketable Securities |
|
$ 0
|
$ 35,377,000
|
| Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments |
|
|
$ (33,000)
|
| Security Owned and Pledged as Collateral, Fair Value |
73,035,000
|
58,780,000
|
|
| Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |
$ 0
|
$ 0
|
|
| Collateralized Mortgage Backed Securities [Member] |
|
|
|
| Number of Securities In Loss Position |
13
|
15
|
|
| Number of Securities |
26
|
26
|
|
| US States and Political Subdivisions Debt Securities [Member] |
|
|
|
| Number of Securities In Loss Position |
33
|
4
|
|
| Number of Securities |
44
|
44
|
|
| Asset-backed Securities [Member] |
|
|
|
| Number of Securities In Loss Position |
2
|
|
|
| Number of Securities |
20
|
|
|
| Debt Securities [Member] |
|
|
|
| Number of Securities Sold |
1
|
|
|
| Available-for-sale Securities, Gross Realized Gains |
$ 365
|
|
|