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7. Notes Payable (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Credit agreements with the Company's primary lender and notes payable
    2019     2018  
    ($ in thousands)  
Notes Payable-            
At prime plus 2%, due October 1, 1985   $ 176     $ 176  
At prime plus 2%, due October 1, 1987     1,000       1,000  
Non-interest bearing, due August 1, 1993     22       22  
    $ 1,198     $ 1,198  
Accrued interest on notes payable
    2019     2018  
      ($ in thousands)  
Notes Payable-            
At prime plus 2%, due October 1, 1985   $ 477     $ 464  
At prime plus 2%, due October 1, 1987     2,908       2,835  
    $ 3,385     $ 3,299