Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual)	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Allowance for Loan and Lease Losses, Troubled Debt Restructuring	$ 1,500,000
Financing Receivable, Modifications, Number of Contracts	1	2	0	0
Net Income (Loss), Excluding Effect of Loan Loss Provision from Troubled Debt Restructuring	$ (422,000)
Net Income (Loss) Attributable to Parent, Total	$ (1,500,000)	$ (2,817,000)	$ 3,196,000	$ 4,147,000
Earnings Per Share, Basic and Diluted, Excluding Effect of Loan Loss Provision from Troubled Debt Restructuring (in dollars per share) | $ / shares	$ 0.11
Earnings Per Share, Basic and Diluted, Total (in dollars per share) | $ / shares	$ (0.39)
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Total	$ 7,400,000	7,400,000	7,800,000
Impairment of Investment in Federal Home Loan Bank Stock and Federal Reserve Bank Stock		0	0
SBA Loan Funds	4,500,000	4,500,000	4,500,000
Financing Receivable, Credit Loss, Expense (Reversal)		4,971,000	1,303,000	$ (857,000)
Goodwill, Impaired, Accumulated Impairment Loss			$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability				$ 2,800,000
Deferred Tax Assets, Valuation Allowance, Total	0	0	$ 0
Deferred Tax Assets, Net of Valuation Allowance, Total	11,100,000	11,100,000	10,900,000
Unrecognized Tax Benefits, Ending Balance	1,220,000	1,220,000	$ 1,132,000
Operating Lease, Right-of-Use Asset	$ 3,160,000	$ 3,160,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset					$ 3,400,000
Operating Lease, Liability, Total					$ 3,400,000
Vesting Period Two [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			4 years
Vesting Period Three [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			5 years
Core Deposits [Member]
Finite-Lived Intangible Asset, Useful Life (Year)		10 years
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		40 years
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Stock Value Par or Stated Value per Share (in dollars per share) | $ / shares	$ 100	$ 100
CONNECTICUT
Number of Operating Branches		7
NEW YORK
Number of Operating Branches		2