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Note 4 - Revenue - Revenues Disaggregated by Major Good or Service Line, Timing of Revenue Recognition, and Sales Channel, Reconciled to Our Reportable Segments (Details) - Detection [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenue from contracts with customers $ 4,073 $ 4,359 $ 12,578 $ 15,167
Direct Sales Force [Member]        
Revenue from contracts with customers 2,825 2,947 8,287 9,347
OEM Partners [Member]        
Revenue from contracts with customers 1,248 1,412 4,291 5,820
Transferred at Point in Time [Member]        
Revenue from contracts with customers 1,834 2,510 5,779 9,844
Transferred over Time [Member]        
Revenue from contracts with customers 2,239 1,849 6,799 5,323
Product [Member]        
Revenue from contracts with customers 2,198 2,536 6,961 9,866
Service Contracts [Member]        
Revenue from contracts with customers $ 1,875 $ 1,823 $ 5,617 $ 5,301