Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Liabilities:
Notes payable due within one year	$ 300,000	$ 300,000
Shareholders' equity:
Common stock, shares outstanding	6,599,912
Common Class A [Member]
Shareholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	3,742,384	3,727,874
Common stock, shares outstanding	3,742,384	3,727,874
Common Class B [Member]
Shareholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	3,500,000	3,500,000
Common stock, shares issued	2,857,528	2,872,038
Common stock, shares outstanding	2,857,528	2,872,038
Nonvoting Common Stock [Member]
Shareholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued
Common stock, shares outstanding