Schedule of Available for Sale (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Fair Value	$ 16,175,000	$ 15,877,000
Marketable Securities	16,175,000	15,877,000
Amoritzed Cost		15,924,000
Gross Unrealized Gains		52,000
Gross Unrealized (Losses)		(99,000)
Fair Value		15,877,000
Fair Value, Less than 12 Months		501,000
Gross Unrealized Gains/(Losses), Less than 12 Months
Fair Value, 12 Months or More		15,423,000
Gross Unrealized Gains/(Losses), 12 Months or More		(47,000)
Gross Unrealized Gains/(Losses), Total		(47,000)
Mutual Funds [Member]
Marketable Securities [Line Items]
Fair Value	16,175,000
Marketable Securities	$ 16,175,000
US Treasury Notes [Member]
Marketable Securities [Line Items]
Marketable Securities		5,699,000
Amoritzed Cost		5,746,000
Gross Unrealized Gains
Gross Unrealized (Losses)		(47,000)
Fair Value		5,699,000
Fair Value, Less than 12 Months		501,000
Gross Unrealized Gains/(Losses), Less than 12 Months
Fair Value, 12 Months or More		5,245,000
Gross Unrealized Gains/(Losses), 12 Months or More		(47,000)
Gross Unrealized Gains/(Losses), Total		(47,000)
US Government Mortgage Backed Securities [Member]
Marketable Securities [Line Items]
Marketable Securities		4,838,000
Amoritzed Cost		4,890,000
Gross Unrealized Gains
Gross Unrealized (Losses)		(52,000)
Fair Value		4,838,000
Fair Value, Less than 12 Months
Gross Unrealized Gains/(Losses), Less than 12 Months
Fair Value, 12 Months or More		4,890,000
Gross Unrealized Gains/(Losses), 12 Months or More		(52,000)
Gross Unrealized Gains/(Losses), Total		(52,000)
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Marketable Securities		5,340,000
Amoritzed Cost		5,288,000
Gross Unrealized Gains		52,000
Gross Unrealized (Losses)
Fair Value		5,340,000
Fair Value, Less than 12 Months
Gross Unrealized Gains/(Losses), Less than 12 Months
Fair Value, 12 Months or More		5,288,000
Gross Unrealized Gains/(Losses), 12 Months or More		52,000
Gross Unrealized Gains/(Losses), Total		$ 52,000