7. Notes Payable (Details 1) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued interest on notes payable	$ 3,385	$ 3,299
At prime plus 2%, due October 1, 1985
Accrued interest on notes payable	477	464
At prime plus 2%, due October 1, 1987
Accrued interest on notes payable	$ 2,908	$ 2,835