7. Credit Agreements - Primary Lender and Notes Payable (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Primary lender-related party	$ 500,000	$ 500,000
Notes payable	1,198,000	1,198,000
Total	1,698,000	1,698,000
Primary lender (PGIP-related party), at prime plus 5%, due June 1, 1997
Primary lender-related party	500,000	500,000
At prime plus 2%, due October 1, 1984
Notes payable	176,000	176,000
At prime plus 2%, due October 1, 1987
Notes payable	1,000,000	1,000,000
Non-interest bearing, due August 1, 1993
Notes payable	$ 22,000	$ 22,000