Note 3 - Loans and Allowance for Loan Losses - Allowance Related to Troubled Debt Restructurings (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Related allowance	$ 131,000	$ 221,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Related allowance	43,000	186,000
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Related allowance	108,000	115,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Related allowance	180,000	201,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]
Related allowance	294,000	365,000
Commercial Portfolio Segment [Member]
Related allowance	756,000	1,088,000
Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Related allowance	48,000	14,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Related allowance	5,000	6,000
Retail Portfolio Segment [Member]
Related allowance	53,000	20,000
Related allowance	$ 809,000	$ 1,108,000