Note 11 - Related Party Transactions (Details Textual)	Dec. 31, 2022 USD ($)
US Subsidiary Of Elekta Member
Purchase Obligation, Total	$ 17,407,000
GKF Subsidiary [Member]
Noncontrolling Interest, Ownership Percentage by Parent	81.00%
US Subsidiary Of Elekta Member
Noncontrolling Interest, Ownership Percentage by Parent	19.00%