Note 12. Stockholders' Equity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 31, 2014
Preferred Stock, Shares Authorized	100,000	100,000
Preferred Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
IhcShareRepurchaseProgramMember
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				500,000
Treasury Stock, Shares, Acquired	143,307	296,775	334,305
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	324,911