Note M - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Treasury Stock, Shares, Acquired		0	486,422
Treasury Stock Acquired, Average Cost Per Share			$ 12.07
Treasury Stock, Value, Acquired, Cost Method	$ 4,614		$ 5,869
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		537,000