Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	$ 713,000	$ 1,108,000
Commercial Portfolio Segment [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	695,000	1,088,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	147,000	221,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	29,000	186,000
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	111,000	115,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	188,000	201,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	220,000	365,000
Retail Portfolio Segment [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	18,000	20,000
Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	18,000	14,000
Retail Portfolio Segment [Member] | 1-4 Family Mortgages [Member]
Note 3 - Loans and Allowance for Loan Losses (Details) - Allowance Related to Troubled Debt Restructurings [Line Items]
Allowance for losses, troubled debt restructurings	$ 0	$ 6,000