Note 4 - Loans Receivable - COVID Loan Forbearance Program (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Number of loans	146
Principal balance	$ 95,539
Principal Amount Deferred	$ 608
COVID 19 [Member] | Standard Forbearance Agreement [Member] | Finance Leases Portfolio Segment [Member]
Number of loans	25
Principal balance	$ 9,211
Principal Amount Deferred	$ 0
Multi-family Mortgage [Member] | COVID 19 [Member] | Small Investment Property Forbearance Agreement [Member]
Number of loans	15
Principal balance	$ 4,511
Principal Amount Deferred	$ 46
Multi-family Mortgage [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member]
Number of loans	53
Principal balance	$ 42,663
Principal Amount Deferred	$ 185
Nonresidential Real Estate [Member] | COVID 19 [Member] | Small Investment Property Forbearance Agreement [Member]
Number of loans	15
Principal balance	$ 5,871
Principal Amount Deferred	$ 93
Nonresidential Real Estate [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member]
Number of loans	28
Principal balance	$ 31,861
Principal Amount Deferred	$ 273
One-to-Four Family Residential Real Estate [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member]
Number of loans	10
Principal Amount Deferred	$ 11
One To Four Family Residential Real Estate Loans [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member]
Principal balance	$ 1,422