Note K - Business Acquisition - Pro Forma Information (Details) - OneEvent Technologies, Inc. [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Net sales	$ 71,786	$ 135,642
Net earnings	$ 7,632	$ 12,898
Net earnings per share (basic and diluted) (in dollars per share)	$ 1.09	$ 1.84
Weighted average shares outstanding (basic and diluted) (in shares)	7,019	7,016