Note 8 - Office Properties and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Depreciation	$ 3,365,000	$ 3,706,000	$ 3,293,000
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	2,200,000
Gain (Loss) on Disposition of Property Plant Equipment	(8,000)	1,019,000	85,000
Impairment of Long-Lived Assets to be Disposed of	634,000	1,076,000
Operating Leases, Future Minimum Payments Due to Oustanding Loan Holders (Lessors)	3,600,000
Operating Leases, Rent Expense	$ 839,000	874,000	721,000
Lessor, Operating Lease, Renewal Term	5 years
Rental Income, Nonoperating	$ 437,000	441,000	$ 435,000
Minimum [Member]
Lessee, Operating Lease, Renewal Term	1 year
Maximum [Member]
Lessee, Operating Lease, Renewal Term	20 years
Office Properties [Member]
Gain (Loss) on Disposition of Property Plant Equipment	$ 27,000	$ 1,000,000