7. Credit Agreements, Notes Payable, Subordinated and Convertible Debentures Payable (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Credit Agreements Notes Payable Subordinated And Convertible Debentures Payable
Notes payable - $1,176,000 bearing interest at prime plus 2%,the remainder non-interest bearing, all past due	$ 1,198	$ 1,198
Subordinated debentures payable:
At 6-1/2% interest; due June 1, 1991	447	447
At 6% interest; due May 1, 1992	8,025	8,025
Subordinated convertible debentures payable	8,472	8,472
Total	$ 9,670	$ 9,670