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Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Revenue from Contract with Customer, Excluding Assessed Tax $ 446 $ 438 $ 403 $ 441 $ 524 $ 344 $ 370 $ 417 $ 1,728 $ 1,655
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Largest Customer [Member]                    
Revenue from Contract with Customer, Excluding Assessed Tax                 $ 399 $ 312
Concentration Risk, Percentage                 23.10% 18.90%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Second Largest Customer [Member]                    
Revenue from Contract with Customer, Excluding Assessed Tax                 $ 236 $ 195
Concentration Risk, Percentage                 13.70% 11.80%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two largest Customers [Member]                    
Concentration Risk, Percentage                 28.40% 62.60%
Number of Customers 2       2       2 2
Accounts Receivable, after Allowance for Credit Loss $ 118       $ 394       $ 118 $ 394
Maximum [Member]                    
Finite-Lived Intangible Asset, Useful Life (Year) 10 years               10 years  
Other Capitalized Property Plant and Equipment [Member] | Minimum [Member]                    
Property, Plant and Equipment, Useful Life (Year) 3 years               3 years  
Other Capitalized Property Plant and Equipment [Member] | Maximum [Member]                    
Property, Plant and Equipment, Useful Life (Year) 10 years               10 years