Note 11: Capital Stock: Schedule of Activity in shares of capital stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Class A Common Stock
Common Stock Outstanding	10,843,576	9,638,798	9,178,945	8,730,227
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	685,753		10,174
Dividends	$ 518,702	$ 459,168	$ 437,138
Conversion of Stock, Shares Issued	323	685	1,406
Class C Common Stock
Common Stock Outstanding	10,974,101	10,135,976	9,660,152	9,214,211
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	318,912
Dividends	$ 522,440	$ 482,675	$ 460,005
Conversion of Stock, Shares Issued	(3,227)	(6,851)	(14,064)