Note 6 - Loans Held for Sale - Delinquent and Non-performing Loans Sold During the Period Indicated (Details) - Nonperforming Financial Instruments [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Loans sold	3	4
Proceeds		$ 2,464
Net (charge-offs) recoveries		$ (263)
Net gain (loss)	$ 63
Proceeds	1,170
Net (charge-offs) recoveries	$ (1)
Multi-family Residential Portfolio Segment [Member]
Loans sold	2	3
Proceeds	$ 765	$ 964
Net (charge-offs) recoveries
Net gain (loss)	$ 63
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Loans sold	1
Proceeds	$ 405
Net (charge-offs) recoveries	(1)
Net gain (loss)
Commercial Real Estate Portfolio Segment [Member]
Loans sold		1
Proceeds		$ 1,500
Net (charge-offs) recoveries		$ (263)