v3.26.1
Note 3 - Net Sales - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 28, 2026
Jun. 29, 2025
Jun. 28, 2026
Jun. 29, 2025
Jun. 28, 2025
Revenue from Contract with Customer, Excluding Assessed Tax $ 95.7 $ 106.6 $ 181.4 $ 205.1 $ 205.1
Defense, First Response, and Healthcare [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 45.1 46.8 85.9 90.6  
Transportation [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 27.6 31.2 54.3 58.2  
Specialty Industrial [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 23.0 28.6 41.2 56.3  
Gas Cylinders Segment [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 46.2 47.0 88.0 88.1  
Gas Cylinders Segment [Member] | Defense, First Response, and Healthcare [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 19.4 20.9 37.5 40.1  
Gas Cylinders Segment [Member] | Transportation [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 15.8 17.8 31.5 32.6  
Gas Cylinders Segment [Member] | Specialty Industrial [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 11.0 8.3 19.0 15.4  
Elektron Segment [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 47.3 50.1 89.4 99.5  
Elektron Segment [Member] | Defense, First Response, and Healthcare [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 25.6 25.5 48.3 49.9  
Elektron Segment [Member] | Transportation [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 9.7 11.2 18.9 22.1  
Elektron Segment [Member] | Specialty Industrial [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 12.0 13.4 22.2 27.5  
Superform Segment [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 2.2 2.6 4.0 4.1  
Superform Segment [Member] | Defense, First Response, and Healthcare [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 0.1 0.4 0.1 0.6  
Superform Segment [Member] | Transportation [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax 2.1 2.2 3.9 3.5  
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   6.9   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   $ 6.9   $ 13.4