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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred Tax Assets, Valuation Allowance $ 14,568 $ 11,171  
Unrecognized Tax Benefits $ 1,480 $ 1,480 $ 1,480
Internal Revenue Service (IRS) [Member]      
Open Tax Year 2019 2020 2021 2022    
New York State Division of Taxation and Finance [Member]      
Open Tax Year 2019 2020 2021 2022    
New York City Department of Finance [Member]      
Open Tax Year 2019 2020 2021 2022    
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards $ 24,216    
Domestic Tax Authority [Member]      
Open Tax Year 2015 2016 2017 2018 2019 2020 2021 2022 2023