Quarterly report pursuant to Section 13 or 15(d)

Schedule of Estimated Fair Value of Financial Instrument (Details)

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Schedule of Estimated Fair Value of Financial Instrument (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cost $ 26,782 $ 32,008
Unrealized gains
Unrealized losses (42) (29)
Fair value 26,740 31,979
Cash and Cash Equivalents [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cost 7,286 8,968
Unrealized gains
Unrealized losses
Fair value 7,286 8,968
Short-Term Investments [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Cost 19,496 23,040
Unrealized gains
Unrealized losses (42) (29)
Fair value $ 19,454 $ 23,011