Note 5 - Loans - Non-performing Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Non-accrual loans	$ 15,702	$ 16,253
Total non-performing loans	15,702	16,253
Mortgage Receivable [Member]
Non-accrual loans	10,659	10,861
Non-Mortgage Loans [Member]
Non-accrual loans	5,043	5,392
Multi-family Residential Portfolio Segment [Member] | Mortgage Receivable [Member]
Non-accrual loans	2,008	2,410
Commercial Real Estate Portfolio Segment [Member] | Mortgage Receivable [Member]
Non-accrual loans	1,488	1,379
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Mortgage Receivable [Member]
Non-accrual loans	1,752	928
One-To-Four Family - Residential Portfolio Segment [Member] | Mortgage Receivable [Member]
Non-accrual loans	5,411	6,144
Small Business Administration Portfolio Segment [Member] | Non-Mortgage Loans [Member]
Non-accrual loans	1,224	1,267
Taxi Medallion Portfolio Segment [Member] | Non-Mortgage Loans [Member]
Non-accrual loans	1,361	613
Commercial Business and Other Portfolio Segment [Member] | Non-Mortgage Loans [Member]
Non-accrual loans	$ 2,458	$ 3,512