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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