Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Loans Still Classified as Non-accrual Status, Period of Past Due	90 days
Financing Receivable Performance Period Under Loan Terms for Reclassification from Non-accrual Status	180 days
Outstanding Loans Balances That Are Considered to Be Within Homogeneous Pools and Not Individually Evaluated for Impairment, Maximum	$ 100
Minimum Balance of Impaired Loan Relationships That Are Individually Evaluated for Impairment	100
Unrecognized Tax Benefits, Ending Balance	0		$ 0
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset		$ 3,200
Operating Lease, Liability, Total		$ 3,700
Other Liabilities [Member]
Operating Lease, Liability, Total	3,471
Other Liabilities [Member] | Guaranteed Minimum Death Benefit [Member]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 113		$ 111