8. Credit Agreements - Primary Lender and Notes Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Primary lender-related party	$ 0	$ 500
Notes payable	1,198	1,198
Total	1,198	1,698
Primary lender (PGIP-related party), at prime plus 5%, due June 1, 1997
Primary lender-related party	0	500
At prime plus 2%, due October 1, 1984
Notes payable	176	176
At prime plus 2%, due October 1, 1987
Notes payable	1,000	1,000
Non-interest bearing, due August 1, 1993
Notes payable	$ 22	$ 22