Note S - Employee Benefit Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0.8	$ 0.8	$ 0.6
Global Technology, Inc. [Member]
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total	0.7	0.9	0.8
Prime World International Holdings, Ltd. (“Prime World”) [Member] | Foreign Plan [Member]
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total	$ 0.8	$ 0.9	$ 0.9