Note M - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Treasury Stock, Shares, Acquired		0	803,762
Treasury Stock Acquired, Average Cost Per Share			$ 12.23
Treasury Stock, Value, Acquired, Cost Method	$ 3,958		$ 9,827
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased		794,913
Stock Issued During Period, Shares, Employee Stock Purchase Plans and Exercise of Share-based Awards		737,000