Statements of Stockholders' Equity (USD $)	Class A Common Stock	Class C Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock	Total
Balance at Dec. 31, 2010	$ 18,357,890	$ 1,932,031	$ 19,689,993	$ 1,188,246	$ 21,907,579	$ (3,147,271)	$ 59,928,468
Net earnings					(518,473)		(518,473)
Other comprehensive income				33,215			33,215
Grant of stock options			64,344				64,344
Sale of treasury stock			11,442			76,753	88,195
Stock dividends	218	2	(29)		(191)
Conversion Class C to Class A	344	(344)
Balance at Mar. 31, 2011	18,358,452	1,931,689	19,765,750	1,221,461	21,388,915	(3,070,518)	59,595,749
Balance at Dec. 31, 2011	19,277,596	2,027,195	19,487,565	654,443	22,546,623	(2,762,835)	61,230,587
Net earnings					1,662,183		1,662,183
Other comprehensive income				979,930			979,930
Grant of stock options			47,218				47,218
Sale of treasury stock			(41,121)			96,635	55,514
Balance at Mar. 31, 2012	$ 19,277,596	$ 2,027,195	$ 19,493,662	$ 1,634,373	$ 24,208,806	$ (2,666,200)	$ 63,975,432