XML 145 R123.htm IDEA: XBRL DOCUMENT v3.23.1
Note 6 - Concentration of Credit Risk (Details Textual) - Customer Concentration Risk [Member]
Pure in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue from Contract with Customer Benchmark [Member]        
Number of Major Customers 0 0 0 0
Accounts Receivable [Member]        
Number of Major Customers   0 0