Note 3 - Loans (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015	Sep. 30, 2016 USD ($)	Sep. 30, 2015	Dec. 31, 2015 USD ($)
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0		$ 0		$ 0
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	$ 80,000		$ 80,000		176,000
Financing Receivable, Modifications, Recorded Investment	999,000		999,000		1,100,000
Allowance for Credit Losses, Change in Method of Calculating Impairment	$ 314,000		$ 314,000		$ 177,000