Marketable Securities (Details) - USD ($)
|
Dec. 31, 2022 |
Dec. 31, 2021 |
| Fair Value [Member] |
|
|
| OtherInvestmentsReadilyMarketableLineItems [Line Items] |
|
|
| Government securities |
$ 20,848,000
|
|
| Fixed income mutual funds |
10,989,000
|
$ 14,325,000
|
| Certificates of deposit |
2,976,000
|
|
| Corporate bonds and notes |
178,000
|
801,000
|
| Total marketable securities |
34,991,000
|
15,126,000
|
| Cost Basis [Member] |
|
|
| OtherInvestmentsReadilyMarketableLineItems [Line Items] |
|
|
| Government securities |
20,781,000
|
|
| Fixed income mutual funds |
11,904,000
|
14,462,000
|
| Certificates of deposit |
3,019,000
|
|
| Corporate bonds and notes |
192,000
|
813,000
|
| Total marketable securities |
35,896,000
|
15,275,000
|
| Gross Unrealized Gains [Member] |
|
|
| OtherInvestmentsReadilyMarketableLineItems [Line Items] |
|
|
| Government securities |
67,000
|
|
| Fixed income mutual funds |
|
|
| Certificates of deposit |
|
|
| Corporate bonds and notes |
|
|
| Total marketable securities |
67,000
|
|
| Gross Unrealized Losses [Member] |
|
|
| OtherInvestmentsReadilyMarketableLineItems [Line Items] |
|
|
| Government securities |
|
|
| Fixed income mutual funds |
(915,000)
|
(137,000)
|
| Certificates of deposit |
(43,000)
|
|
| Corporate bonds and notes |
(14,000)
|
(12,000)
|
| Total marketable securities |
$ (972,000)
|
$ (149,000)
|