v3.26.3
Note 3 - Net Sales - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 27, 2026
Sep. 28, 2025
Sep. 27, 2026
Sep. 28, 2025
Revenue from Contract with Customer, Excluding Assessed Tax $ 91.7 $ 95.6 $ 273.1 $ 300.7
Defense, First Response, and Healthcare [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 43.3 47.4 129.2 138.0
Transportation [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 25.8 28.3 80.1 86.5
Specialty Industrial [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 22.6 19.9 63.8 76.2
Gas Cylinders Segment [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 42.6 42.9 130.6 131.0
Gas Cylinders Segment [Member] | Defense, First Response, and Healthcare [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 21.1 20.0 58.6 60.1
Gas Cylinders Segment [Member] | Transportation [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 13.7 15.7 45.2 48.3
Gas Cylinders Segment [Member] | Specialty Industrial [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 7.8 7.2 26.8 22.6
Elektron Segment [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 46.7 50.0 136.1 149.5
Elektron Segment [Member] | Defense, First Response, and Healthcare [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 21.6 27.1 69.9 77.0
Elektron Segment [Member] | Transportation [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 10.3 10.2 29.2 32.3
Elektron Segment [Member] | Specialty Industrial [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 14.8 12.7 37.0 40.2
Superform Segment [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 2.4 2.7 6.4 6.8
Superform Segment [Member] | Defense, First Response, and Healthcare [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 0.6 0.3 0.7 0.9
Superform Segment [Member] | Transportation [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 1.8 2.4 5.7 5.9
Superform Segment [Member] | Specialty Industrial [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 0.0 0.0 $ 0.0 0.0
Graphic Arts Segment [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax   0.0   13.4
Graphic Arts Segment [Member] | Defense, First Response, and Healthcare [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax   0.0   0.0
Graphic Arts Segment [Member] | Transportation [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax   0.0   0.0
Graphic Arts Segment [Member] | Specialty Industrial [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax   $ 0.0   $ 13.4