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Note 3 - Discontinued Operations (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Feb. 01, 2022
Jul. 01, 2019
Apr. 30, 2023
Jan. 31, 2023
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2020
Impairment of Long-Lived Assets to be Disposed of         $ 68,800 $ 24,000     $ 93,025 $ 0  
Loss Contingency Accrual         $ 2,100     $ 2,100 $ 2,100    
Edwards Vacuum LLC Warranty Claim [Member]                      
Loss Contingency, Damages Sought, Value       $ 1,000              
Loss Contingency Accrual                     $ 2,500
Loss Contingency Accrual, Provision               $ 400      
Edwards Vacuum LLC Warranty Claim [Member] | Settled Litigation [Member]                      
Loss Contingency Accrual, Payments     $ 800       $ 800        
Edwards Vacuum LLC Warranty Claim [Member] | Settled Litigation [Member] | Indemnification Agreement [Member]                      
Loss Contingency, Receivable, Proceeds     $ 1,000                
Discontinued Operations, Disposed of by Sale [Member] | Semiconductor Automation Business [Member]                      
Proceeds from Divestiture of Businesses $ 2,900,000                    
Discontinued Operations, Disposed of by Sale [Member] | Semiconductor Cryogenics Business [Member]                      
Proceeds from Divestiture of Businesses   $ 659,800                  
Revision of Prior Period, Error Correction, Adjustment [Member]                      
Impairment of Long-Lived Assets to be Disposed of           $ 5,600