Note 10 - Related Party Transactions (Details Textual)	Mar. 31, 2023 USD ($)
US Subsidiary Of Elekta Member
Purchase Obligation	$ 20,208,000
GKF Subsidiary [Member]
Noncontrolling Interest, Ownership Percentage by Parent	81.00%
US Subsidiary Of Elekta Member
Noncontrolling Interest, Ownership Percentage by Parent	19.00%