Statements Of Stockholders' Equity - USD ($)	Class A voting Common Stock [Member]	Capital in Excess of Par Value [Member]	Deferred Directors' Compensation [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balances, shares at Sep. 30, 2014	16,863,004
Balances, Treasury shares at Dec. 31, 2014					(355,558)
Balances at Sep. 30, 2014	$ 280,938	$ 2,861,343	$ 3,110,351	$ 118,794,188	$ (5,858,167)	$ 119,188,653
Purchase of treasury stock					$ (120,611)	(120,611)
Purchase of treasury stock, shares					(7,177)
Restricted stock awards		165,111				165,111
Net income (loss)				10,233,761		10,233,761
Dividends ($.08 per share)				(1,333,023)		(1,333,023)
Distribution of restricted stock to officers and directors		(436,303)			$ 377,502	(58,801)
Distribution of restricted stock to officers and directors, shares					23,983
Increase in deferred directors' compensation charged to expense			101,589			101,589
Balances, shares at Dec. 31, 2014	16,863,004
Balances, Treasury shares at Sep. 30, 2014					(372,364)
Balances at Dec. 31, 2014	$ 280,938	2,590,151	3,211,940	127,694,926	$ (5,601,276)	$ 128,176,679
Balances, shares at Sep. 30, 2015	16,863,004
Balances, Treasury shares at Dec. 31, 2015					(284,593)	(284,593)
Balances at Sep. 30, 2015	$ 280,938	2,993,119	3,084,289	125,446,473	$ (4,800,144)	$ 127,004,675
Purchase of treasury stock					$ (117,165)	(117,165)
Purchase of treasury stock, shares					(7,477)
Restricted stock awards		371,407				371,407
Net income (loss)				(2,799,118)		(2,799,118)
Dividends ($.08 per share)				(1,337,982)		(1,337,982)
Distribution of restricted stock to officers and directors		(449,307)			$ 404,541	(44,766)
Distribution of restricted stock to officers and directors, shares					25,507
Increase in deferred directors' compensation charged to expense			85,930			$ 85,930
Balances, shares at Dec. 31, 2015	16,863,004
Balances, Treasury shares at Sep. 30, 2015					(302,623)	(302,623)
Balances at Dec. 31, 2015	$ 280,938	$ 2,915,219	$ 3,170,219	$ 121,309,373	$ (4,512,768)	$ 123,162,981