Note M - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Treasury Stock, Shares, Acquired (in shares)	304,704	0
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 12.26
Treasury Stock, Value, Acquired, Cost Method	$ 3,736
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)	490,209
Stock Issued During Period, Shares, Employee Stock Purchase Plans and Exercise of Share-based Awards (in shares)	789,000