Statements Of Stockholders' Equity - USD ($)	Total	Class A voting Common Stock [Member]	Capital in Excess of Par Value [Member]	Deferred Directors' Compensation [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balances, shares at Sep. 30, 2015		16,863,004
Balances, Treasury shares at Sep. 30, 2015						(302,623)
Balances at Sep. 30, 2015	$ 127,004,675	$ 280,938	$ 2,993,119	$ 3,084,289	$ 125,446,473	$ (4,800,144)
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	(44,766)		(449,307)			$ 404,541
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 Dec. 31, 2015						(284,593)
Balances at Dec. 31, 2015	$ 123,162,981	$ 280,938	2,915,219	3,170,219	121,309,373	$ (4,512,768)
Balances, shares at Sep. 30, 2016		16,863,004
Balances, Treasury shares at Sep. 30, 2016	(262,708)					(262,708)
Balances at Sep. 30, 2016	$ 115,191,819	$ 280,938	3,191,056	3,403,213	112,482,284	$ (4,165,672)
Purchase of treasury stock	(407,677)					$ (407,677)
Purchase of treasury stock, shares						(17,119)
Restricted stock awards	180,412		180,412
Net income (loss)	(2,238,392)				(2,238,392)
Dividends ($.08 per share)	(1,340,359)				(1,340,359)
Distribution of restricted stock to officers and directors	547		(895,402)			$ 895,949
Distribution of restricted stock to officers and directors, shares						56,166
Increase in deferred directors' compensation charged to expense	$ 105,818			105,818
Balances, shares at Dec. 31, 2016		16,863,004
Balances, Treasury shares at Dec. 31, 2016	(223,661)					(223,661)
Balances at Dec. 31, 2016	$ 111,492,168	$ 280,938	$ 2,476,066	$ 3,509,031	$ 108,903,533	$ (3,677,400)