v3.23.2
Note 19 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Tax Expense (Benefit), Total $ 13 $ 5
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation 0 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 13,500 6,400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total $ 0 0
Open Tax Year 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2016 2017 2018 2019 2020 2021 2022  
Increase (Decrease) in Employee Related Liabilities, Total   $ 1,400
Subject to Expiration [Member]    
Operating Loss Carryforwards $ 1,400  
Research Tax Credit Carryforward [Member] | Subject to Expiration [Member]    
Tax Credit Carryforward, Amount 26  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards 346,400  
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 6,600  
Domestic Tax Authority [Member] | Before Tax Year 2018 [Member]    
Operating Loss Carryforwards 114,900  
Domestic Tax Authority [Member] | Tax Years 2018 to 2022 [Member]    
Operating Loss Carryforwards 231,500  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 167,900  
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount $ 4,100