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Note 3 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
US Government Agencies Debt Securities [Member]  
Number of investment positions - less than twelve months 8
Fair value - less than twelve months $ 29,198
Gross unrealized losses - less than twelve months $ 55
Agency Collateralized Mortgage Obligations [Member]  
Number of investment positions - less than twelve months 5
Fair value - less than twelve months $ 5,080
Gross unrealized losses - less than twelve months $ 43
Number of investment positions - more than twelve months 5
Fair value - more than twelve months $ 2,744
Gross unrealized losses - more than twelve months $ 16
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]  
Number of investment positions - less than twelve months 10
Fair value - less than twelve months $ 21,381
Gross unrealized losses - less than twelve months $ 34
Number of investment positions - more than twelve months 1
Fair value - more than twelve months $ 571
Gross unrealized losses - more than twelve months $ 1
Municipal Notes [Member]  
Number of investment positions - less than twelve months 19
Fair value - less than twelve months $ 10,602
Gross unrealized losses - less than twelve months $ 110
Number of investment positions - less than twelve months 42
Fair value - less than twelve months $ 66,261
Gross unrealized losses - less than twelve months $ 242
Number of investment positions - more than twelve months 6
Fair value - more than twelve months $ 3,315
Gross unrealized losses - more than twelve months $ 17
Total securities available for sale 48
Total securities available for sale $ 69,576
Total securities available for sale $ 259