Annual report pursuant to Section 13 and 15(d)

Cash Equivalents and Investments (Narrative) (Details)

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Cash Equivalents and Investments (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]          
Debt securities realized loss       $ 400,000  
Debt securities realized gains       0 $ 0
Common Stock [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Investment $ 899,000        
Proceeds from sale of investment   $ 650,000      
Impairment loss on sale of investment       $ 206,000  
Common Stock [Member] | Scenario, Forecast [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Proceeds from sale of investment     $ 43,000    
Maximum [Member] | Common Stock [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Minority investment, ownership percentage 10.00%