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Note 3 - Investments - Available-For-Sale Marketable Securities (Details) - USD ($)
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-Sale, Amortized Cost, Current $ 34,658,000  
Debt Securities, Available-for-Sale, Unrealized Loss, Current 75,000  
Available-for-sale securities, current portion 34,583,000 $ 0
Debt Securities, Available-for-Sale, Amortized Cost, NoncurrentDebt Securities, Available-for-Sale, Amortized Cost, Noncurrent 490,000  
Available-for-sale securities, long-term 490,000 0
Debt Securities, Available-for-Sale, Amortized Cost, Total 35,148,000  
Total marketable securities 75,000  
Debt Securities, Available-for-Sale, Total 35,073,000  
Due in one year or less 34,658,000  
Due in one year or less 34,583,000 $ 0
Due after one year through five years 490,000  
Due after one year through five years 490,000  
Total 35,148,000  
Marketable debt securities 35,073,000  
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-Sale, Amortized Cost, Current 13,102,000  
Debt Securities, Available-for-Sale, Unrealized Loss, Current 48,000  
Available-for-sale securities, current portion 13,054  
Due in one year or less 13,102,000  
Due in one year or less 13,054  
Corporate Debt Securities [Member]    
Debt Securities, Available-for-Sale, Amortized Cost, Current 20,112,000  
Debt Securities, Available-for-Sale, Unrealized Loss, Current 18,000  
Available-for-sale securities, current portion 20,094,000  
Due in one year or less 20,112,000  
Due in one year or less 20,094,000  
Other Debt Obligations [Member]    
Debt Securities, Available-for-Sale, Amortized Cost, Current 1,444,000  
Debt Securities, Available-for-Sale, Unrealized Loss, Current 9,000  
Available-for-sale securities, current portion 1,435,000  
Debt Securities, Available-for-Sale, Amortized Cost, NoncurrentDebt Securities, Available-for-Sale, Amortized Cost, Noncurrent 490,000  
Debt Securities, Available-for-Sale, Unrealized Loss, Noncurrent 0  
Available-for-sale securities, long-term 490,000  
Due in one year or less 1,444,000  
Due in one year or less 1,435,000  
Due after one year through five years $ 490,000