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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 04, 2015 | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Federal Home Loan Bank Stock and Federal Reserve Bank Stock |  | $ 7,700,000 | $ 8,600,000 |
SBA Loan Funds |  | $ 4,500,000 | 4,500,000 |
Number of Residential Real Estate Loans in Process of Foreclosure |  | 1 |  |
Mortgage Loans in Process of Foreclosure, Amount |  | $ 363,000 |  |
Real Estate Acquired Through Foreclosure |  | 851,000 | 0 |
Deferred Tax Assets, Valuation Allowance |  |  | 572,000 |
Deferred Tax Assets, Net of Valuation Allowance |  | 12,632,000 | 13,763,000 |
Impairment of Investment in Federal Home Loan Bank Stock and Federal Reserve Bank Stock |  | 0 | 0 |
Unrecognized Tax Benefits |  | $ 0 | $ 0 | $ 14,800,000
State and Local Jurisdiction [Member] | Connecticut [Member] | Earliest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2013 |  |
State and Local Jurisdiction [Member] | Connecticut [Member] | Latest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2015 |  |
Vesting Period One [Member] | Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |
Vesting Period One [Member] | Restricted Stock [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |
Vesting Period Two [Member] | Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |
Vesting Period Two [Member] | Restricted Stock [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 40 years |  |
Vesting Period Three [Member] | Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 5 years |  |
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] |  |  |  |
Stock Value Par or Stated Value per Share | $ / shares |  | $ 100 |  |
Federal Reserve Bank Stock [Member] |  |  |  |
Stock Value Par or Stated Value per Share | $ / shares |  | $ 100 |  |
Reverse Stock Split [Member] |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 10 |  |  |
Connecticut [Member] |  |  |  |
Number of Operating Branches |  | 7 |  |
New York [Member] |  |  |  |
Number of Operating Branches |  | 2 |  |

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