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Note 3 - Investment Securities Available for Sale (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
US Government Agencies Debt Securities [Member]  
Number of investment positions - less than twelve months 17
Fair value - less than twelve months $ 43,556
Gross unrealized losses - less than twelve months $ 120
Agency Collateralized Mortgage Obligations [Member]  
Number of investment positions - less than twelve months 5
Fair value - less than twelve months $ 3,109
Gross unrealized losses - less than twelve months $ 38
Number of investment positions - more than twelve months 7
Fair value - more than twelve months $ 4,273
Gross unrealized losses - more than twelve months $ 44
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]  
Number of investment positions - less than twelve months 17
Fair value - less than twelve months $ 21,262
Gross unrealized losses - less than twelve months $ 89
Number of investment positions - more than twelve months 3
Fair value - more than twelve months $ 2,190
Gross unrealized losses - more than twelve months $ 17
Municipal Notes [Member]  
Number of investment positions - less than twelve months 4
Fair value - less than twelve months $ 4,229
Gross unrealized losses - less than twelve months $ 50
Number of investment positions - less than twelve months 43
Fair value - less than twelve months $ 72,156
Gross unrealized losses - less than twelve months $ 297
Number of investment positions - more than twelve months 10
Fair value - more than twelve months $ 6,463
Gross unrealized losses - more than twelve months $ 61
Total securities available for sale 53
Total securities available for sale $ 78,619
Total securities available for sale $ 358