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Note 10 - Significant Customers / Concentration / Disaggregated Revenue - Concentration of Risk (Details) - Customer Concentration Risk [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Revenue Benchmark [Member] | Customer A [Member]      
Concentration Risk, Percentage 12.00%    
Revenue Benchmark [Member] | Customer B [Member]      
Concentration Risk, Percentage   18.00%  
Revenue Benchmark [Member] | Customer C [Member]      
Concentration Risk, Percentage   10.00%  
Accounts Receivable [Member] | Customer B [Member]      
Concentration Risk, Percentage     11.00%
Accounts Receivable [Member] | Customer C [Member]      
Concentration Risk, Percentage     17.00%
Accounts Receivable [Member] | Customer D [Member]      
Concentration Risk, Percentage 12.00%    
Accounts Receivable [Member] | Customer E [Member]      
Concentration Risk, Percentage     16.00%