7. Notes Payable (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued interest on notes payable	$ 3,299	$ 3,218
At prime plus 2%, due October 1, 1985
Accrued interest on notes payable	464	452
At prime plus 2%, due October 1, 1987
Accrued interest on notes payable	$ 2,835	$ 2,766