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6. Investment at Fair Value (Tables)
12 Months Ended
Dec. 31, 2020
Schedule of Investments [Abstract]  
Schedule of gain on investments
   2020   2019 
   (In thousands) 
Change in fair value of investment, warrants  $1,996   $(1,308)
Change in fair value of investment, common stock   3,478    11,207 
Gain on sale of investment, warrants   11,503    – 
Loss on sale of investment, common stock   (3,316)   (9,230)
    Net realized and unrealized gain on investment at fair value  $13,661   $669