Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

v3.21.2
Fair Value of Financial Instruments (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Cost $ 35,746,000  
Unrealized Gains 0  
Unrealized Losses (33,000)  
Fair Value 35,713,000  
Cash and Cash Equivalents [Member]    
Cost 9,682,000 $ 5,297,000
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 9,682,000 $ 5,297,000
Short term Investments [Member]    
Cost 26,064,000  
Unrealized Gains 0  
Unrealized Losses (33,000)  
Fair Value $ 26,031,000