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Note 11 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Assets, Valuation Allowance, Total $ 4,872 $ 5,238
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0  
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   (1,500)
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation   $ 1,500
Domestic Tax Authority [Member]    
Operating Loss Carryforwards, Total 21,661  
Operating Loss Carryforwards, Subject to Expiration 12,054  
Operating Loss Carryforwards. Not Subject to Expiration $ 9,607  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Open Tax Year 2015 2016 2017 2018 2019  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards, Total $ 31,170  
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member]    
Open Tax Year 2015 2016 2017 2018 2019  
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]    
Open Tax Year 2015 2016 2017 2018 2019  
State and Local Jurisdiction [Member] | New York City Department of Finance [Member]    
Open Tax Year 2015 2016 2017 2018 2019