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Note 15 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2021
Dec. 31, 2017
Dec. 31, 2020
Unrecognized Tax Benefits, Income Tax Penalties Accrued   $ 0   $ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00% 35.00%  
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect $ 200      
Domestic Tax Authority [Member]        
Tax Credit Carryforward, Amount   $ 400    
Domestic Tax Authority [Member] | Capital Loss Carryforward [Member]        
Tax Credit Carryforward, Amount   $ 800    
Tax Credit Carryforward, Expiration Year   2024    
Domestic Tax Authority [Member] | Minimum [Member]        
Tax Credit Carryforward, Expiration Year   2023    
Domestic Tax Authority [Member] | Maximum [Member]        
Tax Credit Carryforward, Expiration Year   2026    
State and Local Jurisdiction [Member]        
Tax Credit Carryforward, Amount   $ 4,400    
Tax Credit Carryforward, Expiration Year   2022    
Operating Loss Carryforwards, Total   $ 27,300    
State and Local Jurisdiction [Member] | Minimum [Member]        
Operating Loss Carryforwards, Expiration Year   2022    
State and Local Jurisdiction [Member] | Maximum [Member]        
Operating Loss Carryforwards, Expiration Year   2038    
Foreign Tax Authority [Member]        
Operating Loss Carryforwards, Total   $ 4,600    
Foreign Tax Authority [Member] | Minimum [Member]        
Operating Loss Carryforwards, Expiration Year   2023    
Foreign Tax Authority [Member] | Maximum [Member]        
Operating Loss Carryforwards, Expiration Year   2030