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Note 14 - Income Tax (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Percent, Total (33.50%) (3.70%)
Research and Development Tax Credit Carryforwards Offset by Reserve for Uncertain Tax Positions $ 800  
Deferred Tax Assets, Tax Credit Carryforwards, Total 2,700  
Deferred Tax Assets, Valuation Allowance 15,222 $ 14,506
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 700 200
Cash and Cash Equivalents, at Carrying Value, Total 4,283 4,508
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 400  
Non-US [Member] | Subsidiaries [Member]    
Cash and Cash Equivalents, at Carrying Value, Total 2,100 $ 2,600
Expire 2024 [Member]    
Deferred Tax Assets, Tax Credit Carryforwards, Research 7,800  
State and Local Jurisdiction [Member] | Expire between 2024 and 2043 [Member]    
Operating Loss Carryforwards 6,300  
Foreign Tax Authority [Member]    
Operating Loss Carryforwards 7,800  
Foreign Tax Authority [Member] | Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount $ 400