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Note 3 - Investments
 12 Months Ended
Dec. 31, 2022
Investments, All Other Investments [Abstract]  
Investments Investments
The following tables summarize the fair value of the Company’s investments by type. The estimated fair values of the Company’s fixed income investments are classified as Level 2 in the fair value hierarchy as defined in U.S. GAAP. These valuations are based on observable direct and indirect inputs, primarily quoted prices of similar, but not identical, instruments in active markets or quoted prices for identical or similar instruments in markets that are not active. These fair values are obtained from independent pricing services which utilize Level 2 inputs.
December 31, 2022
Amortized CostAccrued InterestGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Obligations of U.S. Government and its agencies$129,940 $427 $— $(996)$129,371 
Corporate debt securities6,093 37 — (38)6,092 
Certificates of deposit2,163 23 — (29)2,157 
Total Investments$138,196 $487 $— $(1,063)$137,620 
December 31, 2021
Amortized CostAccrued InterestGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Obligations of U.S. Government and its agencies$4,043 $17 $— $(7)$4,053 
Corporate debt securities4,294 40 — (5)4,329 
Certificates of deposit1,652 8 — (1)1,659 
Total Investments$9,989 $65 $— $(13)$10,041 
The following table summarizes the scheduled maturity for the Company’s investments at December 31, 2022 and 2021.
 20222021
Maturing in one year or less$119,543 $3,212 
Maturing after one year through two years18,077 6,829 
Total investments$137,620 $10,041