Note 7 - Borrowings - Securities Sold Under Agreements to Repurchase (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Repurchase agreements and repurchase-to-maturity transactions	$ 61
Gross amount of recognized liabilities for repurchase agreements in Consolidated Statements of Financial Condition	61
Debt Instrument, Redemption, Period One [Member]
Repurchase agreements and repurchase-to-maturity transactions	61
Debt Instrument, Redemption, Period Two [Member]
Repurchase agreements and repurchase-to-maturity transactions	0
Debt Instrument, Redemption, Period Three [Member]
Repurchase agreements and repurchase-to-maturity transactions	0
Debt Instrument, Redemption, Period Four [Member]
Repurchase agreements and repurchase-to-maturity transactions	$ 0