Note 11 - Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Options, Granted, Weighted Average Grant Date Fair Value	$ 0.40	$ 0.77
Options exercisable, weighted average remaining contractual term	4 years 8 months 12 days	4 years 8 months 12 days
Options outstanding, weighted average remaining contractual term	5 years 9 months 18 days	5 years 8 months 12 days
Options, Exercisable, Aggregate Intrinsic Value	$ 276	$ 385
Options, Outstanding, Aggregate Intrinsic Value	276	385
Total unrecognized share-based compensation cost	$ 76	$ 90
Total unrecognized share-based compensation, compensation cost not yet recognized, weighted-average period	1 year 10 months 25 days	1 year 10 months 25 days
Allocated Share-based Compensation Expense	$ 95	$ 149
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	876,981
2004 Stock Incentive Plan Of Evans Sutherland Computer Corporation | Directors
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	10,000