Note N - Segment Information - Selected Operating Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 37,756	$ 26,020	$ 106,210	$ 82,595
Income from operations	5,009	1,414	10,953	2,039
Cordless [Member]
Revenues	10,518	12,542	33,436	32,538
Income from operations	4,460	4,449	13,512	11,223
IoAT [Member]
Revenues	27,238	13,478	72,774	50,057
Income from operations	$ 549	$ (3,035)	$ (2,559)	$ (9,184)