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Note 1 - The Company and Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Restricted Cash, Total $ 1,200 $ 1,200    
Proceeds from Dividends Received 0      
Payments for Advance to Affiliate     $ 600  
Impairment, Long-Lived Asset, Held-for-Use, Total $ 0 0 0  
Number of Reporting Units 1      
Capitalized Contract Cost, Amortization Period (Year) 5 years      
Advertising Expense $ 2,100 $ 1,600 $ 1,500  
Minimum [Member]        
Property, Plant and Equipment, Useful Life (Year) 3 years      
Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year) 5 years      
Preferred Stock [Member]        
Investments, Total       $ 2,500
Other than Temporary Impairment Losses, Investments, Total       $ 0