Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Revenue (Details Textual)

v3.21.2
Note 2 - Revenue (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Revenue from Contract with Customers, Sales Returns, Percent     1.00%  
Increase (Decrease) in Contract with Customer, Liability $ 4,000   $ 2,973 $ (1,045)
Contract with Customer, Liability, Revenue Recognized $ 1,000      
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]        
Number of Major Markets 0 0 0 0
Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Number of Major Customers 0 0 0 0
Minimum [Member]        
Revenue from Contract with Customer, Sales Returns Policy Term (Day)     14 days  
Revenue from Contract with Customers, Historical Sales Returns, Percent     1.00%  
Maximum [Member]        
Revenue from Contract with Customer, Sales Returns Policy Term (Day)     1 year  
Revenue from Contract with Customers, Historical Sales Returns, Percent     8.00%