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Note 7 - Accrued Retirement Benefits - Summary of Assumptions Used (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Expected long-term return on plan assets 5.00% 4.00%
Minimum [Member]    
Discount rate 5.11% 2.69%
Maximum [Member]    
Discount rate 5.14% 2.74%