Note 10 - Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Options, Granted, Weighted Average Grant Date Fair Value	$ 1.14	$ 0.79
Options exercisable, weighted average remaining contractual term	4 years 4 months 24 days	4 years 1 month 6 days
Options outstanding, weighted average remaining contractual term	5 years 9 months 18 days	5 years 9 months 18 days
Options, Exercisable, Aggregate Intrinsic Value	$ 566	$ 728
Options, Outstanding, Aggregate Intrinsic Value	637	1,038
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		137
Total unrecognized share-based compensation cost	$ 140	$ 198
Total unrecognized share-based compensation, compensation cost not yet recognized, weighted-average period	2 years 4 months 24 days	3 years 9 months 18 days
Allocated Share-based Compensation Expense	$ 177	$ 171
2004 Stock Incentive Plan Of Evans Sutherland Computer Corporation
Minimum exercise price for options	The 2014 Plan continues a minimum exercise price for options of 110% of fair market value on the date of grant.
Number of Shares Authorized	989,081
Directors | 2004 Stock Incentive Plan Of Evans Sutherland Computer Corporation
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	10,000