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Schedule of Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Marketable Securities [Line Items]    
Amortized Cost $ 16,335 $ 15,924
Gross Unrealized Gains/(Losses) (200) (47)
Fair Value 16,135 15,877
Marketable securities 16,135 15,877
Fair Value, 12 Months or More 16,335 15,423
Gross Unrealized Gains/(Losses), 12 Months or More (200) (47)
Fair Value, Less than 12 Months   501
Gross Unrealized Gains/(Losses), Less than 12 Months  
US Treasury Notes [Member]    
Marketable Securities [Line Items]    
Amortized Cost 5,502 5,746
Gross Unrealized Gains/(Losses) (76) (47)
Fair Value 5,426 5,699
Marketable securities 5,426 5,699
Fair Value, 12 Months or More 5,502 5,245
Gross Unrealized Gains/(Losses), 12 Months or More (76) (47)
Fair Value, Less than 12 Months   501
Gross Unrealized Gains/(Losses), Less than 12 Months  
U.S. Government Mortgage Backed Securities [Member]    
Marketable Securities [Line Items]    
Amortized Cost 4,401 4,890
Gross Unrealized Gains/(Losses) 288 (52)
Fair Value 4,689 4,838
Marketable securities 4,689 4,838
Fair Value, 12 Months or More 4,401 4,890
Gross Unrealized Gains/(Losses), 12 Months or More 288 (52)
Fair Value, Less than 12 Months  
Gross Unrealized Gains/(Losses), Less than 12 Months  
Corporate Debt Securities [Member]    
Marketable Securities [Line Items]    
Amortized Cost 6,432 5,288
Gross Unrealized Gains/(Losses) (412) 52
Fair Value 6,020 5,340
Marketable securities 6,020 5,340
Fair Value, 12 Months or More 6,432 5,288
Gross Unrealized Gains/(Losses), 12 Months or More $ (412) 52
Fair Value, Less than 12 Months  
Gross Unrealized Gains/(Losses), Less than 12 Months