Note 5 - Loans Held for Sale (Details Textual) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance	$ 15,300,000
Loans Serviced By Entity But Owned By a Third Party	13,600,000	$ 1,900,000
Servicing Asset, Total	201,000		$ 0
Servicing Asset at Fair Value, Amount, Ending Balance	280,000
Commercial Portfolio Segment [Member]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance	10,200,000
Commercial Real Estate Portfolio Segment [Member]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance	$ 5,100,000