| Marketable securities |
|
|
| March 31, 2021
|
|
|
|
| Cost Basis
|
|
| Gross Unrealized Gains
|
|
| Gross Unrealized Losses
|
|
| Fair Value
|
|
| Certificates of deposit
|
| $
| 2,279,000
|
|
| $
| —
|
|
| $
| (7,000
| )
|
| $
| 2,272,000
|
|
| Fixed income mutual funds
|
|
| 11,377,000
|
|
|
| —
|
|
|
| (16,000
| )
|
|
| 11,361,000
|
|
| Corporate bonds and notes
|
|
| 3,515,000
|
|
|
| 1,000
|
|
|
| —
|
|
|
| 3,516,000
|
|
| Total marketable securities
|
| $
| 17,171,000
|
|
| $
| 1,000
|
|
| $
| (23,000
| )
|
| $
| 17,149,000
|
|
|
|
| December 31, 2020
|
|
|
|
| Cost Basis
|
|
| Gross Unrealized Gains
|
|
| Gross Unrealized Losses
|
|
| Fair Value
|
|
| Certificates of deposit
|
| $
| 3,534,000
|
|
| $
| 7,000
|
|
| $
| —
|
|
| $
| 3,541,000
|
|
| Fixed income mutual funds
|
|
| 11,255,000
|
|
|
| 80,000
|
|
|
| —
|
|
|
| 11,335,000
|
|
| Corporate bonds and notes
|
|
| 4,500,000
|
|
|
| 18,000
|
|
|
| (28,000
| )
|
|
| 4,490,000
|
|
| Total marketable securities
|
| $
| 19,289,000
|
|
| $
| 105,000
|
|
| $
| (28,000
| )
|
| $
| 19,366,000
|
|
|