Note O - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended					132 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2019	Dec. 31, 2016
Deferred Tax Assets, Operating Loss Carryforwards, Total	$ 21,516	$ 12,049
Deferred Tax Assets, in Process Research and Development	8,264	6,648
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 4,599	$ 4,599
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%
Unrecognized Tax Benefits, Ending Balance	$ 181	$ 181	$ 181				$ 181
Income Tax Examination, Penalties and Interest Accrued, Total	$ 0	0	0
Tax Cuts and Jobs Act, Measurement Period Adjustment, Increase (Decrease) in Effective Tax Rate	0.279
Global Technology, Inc. [Member]
Income Tax Holiday, Aggregate Dollar Amount	$ 1,000	$ 500	$ 1,400
Income Tax Holiday, Income Tax Benefits Per Share	$ 0.05	$ 0.03	$ 0.07
State Administration of Taxation, China [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	25.00%
State Administration of Taxation, China [Member] | Global Technology, Inc. [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				15.00%	15.00%	15.00%
Domestic Tax Authority [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Total	$ 75,900
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	32,700
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	43,200
Deferred Tax Assets, in Process Research and Development	$ 8,300
Open Tax Year	2016 2017 2018
Foreign Tax Authority [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		$ 4,600
Open Tax Year	2010 2011 2012 2013 2014 2015 2016 2017 2018 2019