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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets, Valuation Allowance, Total $ 2,523 $ 4,872
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards, Total 10,866  
Operating Loss Carryforwards, Subject to Expiration 1,165  
Operating Loss Carryforwards. Not Subject to Expiration $ 9,700  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Open Tax Year 2016 2017 2018 2019 2020  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards, Total $ 25,031  
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member]    
Open Tax Year 2016 2017 2018 2019 2020  
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]    
Open Tax Year 2016 2017 2018 2019 2020  
State and Local Jurisdiction [Member] | New York City Department of Finance [Member]    
Open Tax Year 2016 2017 2018 2019 2020