Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Common Stock Outstanding [Member]
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Purchases of shares of common stock, shares (in shares)	1,000
Treasury Stock [Member]
Purchases of shares of common stock, shares (in shares)	1,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01