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Consolidated Balance Sheets (Parenthetical) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Preferred stock, no par value      
Preferred stock, authorized 18,500,000 18,500,000
Preferred stock, issued 0 0
Preferred stock, outstanding 0 0
Common stock, no par value      
Common stock, authorized 40,000,000 40,000,000
Common stock, issued 11,434,216 10,877,537
Common stock, outstanding 11,434,216 10,877,537
7% Series A Cumulative Convertible Preferred Stock [Member]
    
Preferred stock, liquidation preference, per share $ 10.00 $ 10.00
Preferred stock, no par value      
Preferred stock, authorized 1,500,000 1,500,000
Preferred stock, issued 191,750 241,182
Preferred stock, outstanding 191,750 241,182