Note 7 - Loans and Allowance for Loan Losses - Risk Category of Consumer Loans by Class (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Consumer Secured [Member]
Loans, net of unearned income	$ 4,589,000	$ 6,655,000
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Consumer Unsecured [Member]
Loans, net of unearned income	5,102,000	5,611,000
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Consumer Secured [Member]
Loans, net of unearned income	8,000	10,000
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Consumer Unsecured [Member]
Loans, net of unearned income	136,000	143,000
Consumer Portfolio Segment [Member] | Consumer Secured [Member]
Loans, net of unearned income	4,597,000	6,665,000
Consumer Portfolio Segment [Member] | Consumer Unsecured [Member]
Loans, net of unearned income	5,238,000	5,754,000
Consumer Portfolio Segment [Member]
Loans, net of unearned income	9,835,000	12,419,000
Loans, net of unearned income	$ 950,716,000	$ 959,275,000