Note 7 - Foreclosed Real Estate (Details Textual) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Real Estate Acquired Through Foreclosure	$ 4,674,000				$ 4,890,000				$ 4,674,000	$ 4,890,000
Financing Receivable, Allowance for Credit Losses, Write-downs									918,000	1,679,000
Provision for Loan and Lease Losses	220,000	$ 200,000	$ 150,000	$ 75,000	0	$ 0	$ 50,000	$ 0	645,000	50,000
Gains (Losses) on Sales of Other Real Estate									30,000	15,000
Foreclosed Real Estate Expense									173,000	50,000
Mortgage Loans in Process of Foreclosure, Amount	793,000				313,000				793,000	313,000
Foreclosed Real Estate [Member]
Financing Receivable, Allowance for Credit Losses, Write-downs									278,000	1,200,000
Provision for Loan and Lease Losses									80,000	100,000
Deferred Gain on Sale of Property	$ 10,000				$ 10,000				$ 10,000	$ 10,000