Note Q - Business Acquisition - Pro Forma Information (Details) - OneEvent Technologies, Inc. [Member] $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Net sales	$ 308,561
Net earnings	$ 40,822
Net earnings per share (basic and diluted) (in dollars per share) | $ / shares	$ 5.82
Weighted average shares outstanding (basic and diluted) (in shares) | shares	7,018