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Note 2 - Securities - Debt Securities by Maturity (Details)
Mar. 31, 2017
USD ($)
Due in 2017 1.45%
Due in 2017 $ 30,644,000
Due in 2017 $ 30,670,000
Due in 2018 through 2022 2.24%
Due in 2018 through 2022 $ 97,092,000
Due in 2018 through 2022 $ 97,132,000
Due in 2023 through 2027 2.68%
Due in 2023 through 2027 $ 93,216,000
Due in 2023 through 2027 $ 90,060,000
Due in 2028 and beyond 2.84%
Due in 2028 and beyond $ 73,501,000
Due in 2028 and beyond $ 68,918,000
Total available for sale securities 2.36%
Available-for-sale Debt Securities, Amortized Cost Basis $ 339,964,000
Total available for sale securities $ 332,441,000
Collateralized Mortgage Backed Securities [Member]  
No single maturity, weighted average yield 1.85%
No single maturity, amortized cost $ 43,525,000
No single maturity, fair value $ 43,704,000
Other Debt and Equity Securities [Member]  
No single maturity, weighted average yield 0.65%
No single maturity, amortized cost $ 1,986,000
No single maturity, fair value $ 1,957,000