Note 6 - Loans Held for Sale - Delinquent and Non-performing Loans Sold During the Period Indicated (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Nonperforming Financial Instruments [Member]
Loans sold	2	6	5	12
Proceeds	$ 3,948	$ 4,210	$ 5,118	$ 8,739
Net recoveries (charge-offs)	0	68	(1)	68
Net gain (loss)	$ 204	$ 10	$ 267	$ (225)
Nonperforming Financial Instruments [Member] | Multi-family Residential Portfolio Segment [Member]
Loans sold	1	1	3	4
Proceeds	$ 700	$ 595	$ 1,465	$ 1,559
Net recoveries (charge-offs)	0	0	0	0
Net gain (loss)	$ 204	$ 0	$ 267	$ 0
Nonperforming Financial Instruments [Member] | Commercial Business and Other Portfolio Segment [Member]
Loans sold	1		1
Proceeds	$ 3,248		$ 3,248
Net recoveries (charge-offs)	0		$ 0
Net gain (loss)	$ 0
Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans sold		1		4
Proceeds		$ 2,500		$ 6,065
Net recoveries (charge-offs)		0		0
Net gain (loss)		$ 0		$ (235)
Nonperforming Financial Instruments [Member] | One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Loans sold		2	1	2
Proceeds		$ 725	$ 405	$ 725
Net recoveries (charge-offs)		(4)	(1)	(4)
Net gain (loss)		$ 0	$ 0	$ 0
Nonperforming Financial Instruments [Member] | One-To-Four Family - Residential Portfolio Segment [Member]
Loans sold		2		2
Proceeds		$ 390		$ 390
Net recoveries (charge-offs)		72		72
Net gain (loss)		$ 10		$ 10
Performing Financial Instruments [Member]
Loans sold			3	9
Proceeds			$ 2,069	$ 5,671
Net (charge-offs) recoveries			0	0
Net gain (loss)			$ 114	$ 393
Performing Financial Instruments [Member] | Small Business Administration Portfolio Segment [Member]
Loans sold			3
Proceeds			$ 2,069
Net (charge-offs) recoveries			0
Net gain (loss)			$ 114