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Note 5 - Loans and Allowance for Loan Losses - Net (Charge-Offs)/Recoveries, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Loans Receivable | $ (19,145) | $ (14,504)
Consumer Portfolio Segment [Member] |  |
Loans Receivable | (4,412) | (3,747)
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] |  |
Loans Receivable | (2,884) | (2,288)
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |
Loans Receivable | (1,528) | (1,459)
Commercial Real Estate Portfolio Segment [Member] |  |
Loans Receivable | (6,999) | (7,166)
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Loans Receivable | 100 | (16)
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |
Loans Receivable | (1,045) | (706)
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] |  |
Loans Receivable | (6,054) | (6,444)
Commercial Portfolio Segment [Member] |  |
Loans Receivable | (7,734) | (3,591)
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |
Loans Receivable | (7,734) | (1,255)
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |
Loans Receivable |  | $ (2,336)

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