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Note 8 - Borrowings (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Note 8 - Borrowings (Details) [Line Items] |  |  |  |
Advances from Federal Home Loan Banks |  |  | $ 134,900,000 | $ 132,000,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  |  | $ 213,200,000 |
Derivative, Variable Interest Rate |  |  | 3.78% |
Number of Consecutive Quarters for Interest Deferment |  |  |  | 20
Interest Expense, Debt |  | $ 1,600,000 |  |
Interest Payable |  |  | $ 510,000 |
Proceeds from Notes Payable | $ 2,000,000 |  |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Note 8 - Borrowings (Details) [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.15% |
Unsecured Debt [Member] | Trust [Member] |  |  |  |
Note 8 - Borrowings (Details) [Line Items] |  |  |  |
Subordinated Debt |  |  | $ 8,200,000 |
Notes Payable, Other Payables [Member] |  |  |  |
Note 8 - Borrowings (Details) [Line Items] |  |  |  |
Debt Instrument, Term | 10 years |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.75% |  |  |
Minimum [Member] |  |  |  |
Note 8 - Borrowings (Details) [Line Items] |  |  |  |
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate |  |  | 6 days |
Federal Home Loan Bank, Advances, Interest Rate |  |  | 0.02% |
Maximum [Member] |  |  |  |
Note 8 - Borrowings (Details) [Line Items] |  |  |  |
Federal Home Loan Bank, Advances, Maturity Period, Fixed Rate |  |  | 59 months |
Federal Home Loan Bank, Advances, Interest Rate |  |  | 0.47% |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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