Condensed Consolidated Balance Sheets (Parentheticals) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Parentheticals - Balance Sheet [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	58,000,000	58,000,000
Common Stock, Shares, Issued	30,137,141	29,508,626
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	2,000,000	2,000,000
Preferred Stock, Shares Issued	0	2,000
Preferred Stock, Shares Outstanding	0	2,000
Treasury Stock, Shares	1,566,288	1,651,874