Condensed Consolidated Statements of Shareholders' Equity - USD ($)	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Class B Stock [Member] Common Stock [Member]
Beginning balance at Sep. 30, 2020	$ 161,220,000	$ 1,229,000	$ 12,331,000	$ 147,428,000	$ 232,000
Beginning balance, shares at Sep. 30, 2020		12,287,337			2,318,857
Net income (loss)	1,551,000			1,551,000
Ending balance at Dec. 31, 2020	162,771,000	$ 1,229,000	12,331,000	148,979,000	$ 232,000
Ending balance, shares at Dec. 31, 2020		12,287,337			2,318,857
Beginning balance at Sep. 30, 2021	167,289,000	$ 1,234,000	12,590,000	153,233,000	$ 232,000
Beginning balance, shares at Sep. 30, 2021		12,338,845			2,318,857
Net income (loss)	(274,000)			(274,000)
Ending balance at Dec. 31, 2021	$ 167,015,000	$ 1,234,000	$ 12,590,000	$ 152,959,000	$ 232,000
Ending balance, shares at Dec. 31, 2021		12,338,845			2,318,857