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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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