Annual report pursuant to Section 13 and 15(d)

Marketable Securities (Details)

v3.22.1
Marketable Securities (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Fair Value [Member]    
Other Investment Not Readily Marketable [Line Items]    
Fixed income mutual funds $ 14,325,000 $ 11,335,000
Corporate bonds and notes 801,000 4,490,000
Total marketable securities 15,126,000 19,366,000
Certificates of deposit   3,541,000
Cost Basis [Member]    
Other Investment Not Readily Marketable [Line Items]    
Fixed income mutual funds 14,462,000 11,255,000
Corporate bonds and notes 813,000 4,500,000
Total marketable securities 15,275,000 19,289,000
Certificates of deposit   3,534,000
Gross Unrealized Gains [Member]    
Other Investment Not Readily Marketable [Line Items]    
Fixed income mutual funds 80,000
Corporate bonds and notes 18,000
Total marketable securities 105,000
Certificates of deposit   7,000
Gross Unrealized Losses [Member]    
Other Investment Not Readily Marketable [Line Items]    
Fixed income mutual funds (137,000)
Corporate bonds and notes (12,000) (28,000)
Total marketable securities $ (149,000) (28,000)
Certificates of deposit