Consolidated Balance Sheets (Parenthetical) ((Unaudited)) (USD $)	Mar. 31, 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	10,907,244	10,877,537
Common stock, outstanding	10,907,244	10,877,537
7% Series A Cumulative Convertible Preferred Stock
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	210,555	241,182
Preferred stock, outstanding	210,555	241,182