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Note 5 - Revenue from Contracts with Customers (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,196 $ 2,158 $ 4,380 $ 4,546 $ 6,012 $ 4,247 $ 0
Contract with Customer, Liability, Revenue Recognized     1,500 $ 900 $ 900 $ 500  
Revenue Benchmark [Member] | Customer Concentration Risk [Member]              
Number of Major Customers   1   1 2 1  
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]              
Revenue from Contract with Customer, Excluding Assessed Tax $ 900   $ 4,400 $ 3,800 $ 4,800    
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member] | Minimum [Member]              
Concentration Risk, Percentage 10.00%   10.00% 10.00% 10.00%    
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]              
Revenue from Contract with Customer, Excluding Assessed Tax   $ 1,700       $ 3,900  
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] | Minimum [Member]              
Concentration Risk, Percentage   10.00%       10.00%  
Transferred over Time [Member]              
Revenue from Contract with Customer, Excluding Assessed Tax $ 413 $ 0 $ 1,236 $ 1,524 $ 1,600 $ 3,800  
Transferred at Point in Time [Member]              
Revenue from Contract with Customer, Excluding Assessed Tax $ 783 $ 2,158 $ 3,144 $ 3,022 $ 4,400 $ 400