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Note 17 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00% 21.00% 35.00%
Tax Cuts and Jobs Act, Income Tax Expense (Benefit), Total $ 900      
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit), Total 600      
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense $ 200      
Open Tax Year   2015 2016 2017 2018 2019    
Unrecognized Tax Benefits, Income Tax Penalties Accrued   $ 0 $ 0  
Domestic Tax Authority [Member]        
Operating Loss Carryforwards, Total   13,200    
Operating Loss Carryforwards, Expired Between 2035 and 2036   6,700    
Operating Loss Carryforwards, Indefinite lived   6,500    
Tax Credit Carryforward, Amount   2,900    
Domestic Tax Authority [Member] | Capital Loss Carryforward [Member]        
Tax Credit Carryforward, Amount   900    
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards, Total   32,100    
Tax Credit Carryforward, Amount   4,200    
Foreign Tax Authority [Member]        
Operating Loss Carryforwards, Total   $ 3,000