Note 5 - Loans - Non-performing Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Loans ninety days or more past due and still accruing	$ 445	$ 0
Non-accrual loans	14,260	16,253
Total non-performing loans	14,705	16,253
Mortgage Receivable [Member]
Non-accrual loans	9,737	10,861
Non-Mortgage Loans [Member]
Non-accrual loans	4,523	5,392
Multi-family Residential Portfolio Segment [Member]
Loans ninety days or more past due and still accruing	445	0
Multi-family Residential Portfolio Segment [Member] | Mortgage Receivable [Member]
Non-accrual loans	3,132	2,410
Commercial Real Estate Portfolio Segment [Member] | Mortgage Receivable [Member]
Non-accrual loans	872	1,379
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Mortgage Receivable [Member]
Non-accrual loans	683	928
One-To-Four Family - Residential Portfolio Segment [Member] | Mortgage Receivable [Member]
Non-accrual loans	5,050	6,144
Small Business Administration Portfolio Segment [Member] | Non-Mortgage Loans [Member]
Non-accrual loans	1,151	1,267
Taxi Medallion Portfolio Segment [Member] | Non-Mortgage Loans [Member]
Non-accrual loans	1,352	613
Commercial Business and Other Portfolio Segment [Member] | Non-Mortgage Loans [Member]
Non-accrual loans	$ 2,020	$ 3,512