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Schedule of Available for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Marketable Securities [Line Items]    
Amortized Cost $ 16,513 $ 15,924
Gross Unrealized Gains/(Losses) (203) (47)
Fair Value 16,310 15,877
Marketable securities 16,310 15,877
Fair Value, Less than 12 Months 499 501
Gross Unrealized Gains/(Losses), Less than 12 Months
Fair Value, 12 Months or More 16,014 15,423
Gross Unrealized Gains/(Losses), 12 Months or More (203) (47)
Gross Unrealized Gains/(Losses) (203) (47)
US Treasury Securities [Member]    
Marketable Securities [Line Items]    
Amortized Cost 5,730 5,746
Gross Unrealized Gains/(Losses) (104) (47)
Fair Value 5,626 5,699
Marketable securities 5,626 5,699
Fair Value, Less than 12 Months 501
Gross Unrealized Gains/(Losses), Less than 12 Months
Fair Value, 12 Months or More 5,730 5,245
Gross Unrealized Gains/(Losses), 12 Months or More (104) (47)
Gross Unrealized Gains/(Losses) (104) (47)
US Government Agencies Debt Securities [Member]    
Marketable Securities [Line Items]    
Amortized Cost 4,317 4,890
Gross Unrealized Gains/(Losses) 359 (52)
Fair Value 4,676 4,838
Marketable securities 4,676 4,838
Fair Value, Less than 12 Months
Gross Unrealized Gains/(Losses), Less than 12 Months
Fair Value, 12 Months or More 4,317 4,890
Gross Unrealized Gains/(Losses), 12 Months or More 359 (52)
Gross Unrealized Gains/(Losses) 359  
Corporate Debt Securities [Member]    
Marketable Securities [Line Items]    
Amortized Cost 6,466 5,288
Gross Unrealized Gains/(Losses) (458) 52
Fair Value 6,008 5,340
Marketable securities 6,008 5,340
Fair Value, Less than 12 Months 499
Gross Unrealized Gains/(Losses), Less than 12 Months
Fair Value, 12 Months or More 5,967 5,288
Gross Unrealized Gains/(Losses), 12 Months or More (458) 52
Gross Unrealized Gains/(Losses) $ (458) 52
U.S. Government Mortgage Backed Securities [Member]    
Marketable Securities [Line Items]    
Gross Unrealized Gains/(Losses)   $ (52)