Note 12 - Income Taxes - Components of Deferred Tax Assets (Liabilities) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan Losses	$ 1,841,000	$ 2,775,000
Acquried Loans Fair Market Value Adjustment	470,000	2,168,000
Acquired Securities Difference in Basis	(450,000)	(744,000)
Amortization of Start-Up Costs	26,000	55,000
Stock Warrants and Options	693,000	1,217,000
Depreciation	(476,000)	(799,000)
Interest on Acquired Nonaccrual Loans	25,000	42,000
Unrealized Loss on Securities	437,000	1,201,000
Other Real Estate	35,000	110,000
Core Deposit Intangible	421,000	775,000
Acquired FHLB Debt Fair Market Value Adjustment		228,000
Deferred Compensation	473,000	723,000
Alternative Minimum Tax Credit	310,000	345,000
Net Operating Loss Carryforward	42,000	78,000
Net Deferred Tax Asset	$ 3,005,000	$ 6,624,000