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Note 3 - Investment Securities Available for Sale (Details)
$ in Thousands
Jun. 30, 2016
USD ($)
US Government Agencies Debt Securities [Member]  
Number of investment positions - less than twelve months 4
Fair value - less than twelve months $ 18,987
Gross unrealized losses - less than twelve months $ 20
Agency Collateralized Mortgage Obligations [Member]  
Number of investment positions - less than twelve months 2
Fair value - less than twelve months $ 1,736
Gross unrealized losses - less than twelve months $ 9
Number of investment positions - more than twelve months 5
Fair value - more than twelve months $ 2,959
Gross unrealized losses - more than twelve months $ 10
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]  
Number of investment positions - less than twelve months 6
Fair value - less than twelve months $ 17,533
Gross unrealized losses - less than twelve months $ 30
Number of investment positions - more than twelve months 2
Fair value - more than twelve months $ 1,241
Gross unrealized losses - more than twelve months $ 5
Municipal Notes [Member]  
Number of investment positions - less than twelve months 2
Fair value - less than twelve months $ 930
Gross unrealized losses - less than twelve months $ 2
Number of investment positions - less than twelve months 14
Fair value - less than twelve months $ 39,186
Gross unrealized losses - less than twelve months $ 61
Number of investment positions - more than twelve months 7
Fair value - more than twelve months $ 4,200
Gross unrealized losses - more than twelve months $ 15
Total securities available for sale 21
Total securities available for sale $ 43,386
Total securities available for sale $ 76