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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Preferred Stock, Par Value Per Share $ 1.00 $ 1.00
Preferred Stock, Shares Authorized 20,000,000 20,000,000
Preferred Stock, Dividend Rate, Percentage 7.50%  
Preferred Stock, Shares Issued 104,574  
Preferred Stock, Liquidation Preference, Value $ 111,500,000  
Common Stock, Shares, Issued 9,038,751  
Common Class A [Member]    
Common Stock, Par Value Per Share $ 0.10 $ 0.10
Common Stock, Shares Authorized 70,000,000 70,000,000
Common Stock, Shares, Issued 7,632,669 7,563,600
Common Class B [Member]    
Common Stock, Par Value Per Share $ 0.10 $ 0.10
Common Stock, Shares Authorized 30,000,000 30,000,000
Common Stock, Shares, Issued 1,406,082 1,436,400