Note 12 - Leases (Details Textual)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Number of Operating Leases, Lessee	10
Number of Operating Leases in Bank Branch Locations, Lessee	4
Number of Operating Leases in Administrative and Operational Spaces, Lessee	4
Number of Operating Leases for ITM Locations, Lessee	1
Number of Operating Leases in Equipment Leases, Lessee	1
Operating Lease, Right-of-Use Asset	$ 2,739,000	$ 3,200,000
Retained Earnings (Accumulated Deficit), Ending Balance	(42,592,000)	(38,773,000)
Operating Lease, Cost	565,000	517,000
Variable Lease, Cost	38,000	27,000
Lessee, Operating Lease, Liability, to be Paid, Total	3,417,000	3,900,000
Lessor, Operating Lease, Payments to be Received, Total	1,700,000	2,000,000
Operating Lease, Expense	583,000	636,000	$ 593,000
Operating Lease, Lease Income, Total	523,000	589,000	413,000
Operating Lease, Initial Direct Cost Expense, over Term	5,000	5,000	$ 5,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance				$ (11,000)
Accrued Expenses and Other Liabilities [Member]
Operating Lease, Liability, Total	$ 2,865,000	$ 3,300,000