Consolidated Statements of Income and Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Revenues
Revenue from Contract with Customer, Including Assessed Tax	$ 13,970,000	$ 12,356,000	$ 24,390,000	$ 24,033,000
Costs and expenses
Salaries and employee benefits	9,901,000	9,678,000	17,793,000	18,565,000
Outside services	719,000	1,154,000	1,442,000	2,014,000
Postage and delivery expenses	161,000	191,000	330,000	401,000
Newsprint and printing expenses	153,000	193,000	307,000	371,000
Depreciation and amortization	115,000	128,000	230,000	256,000
Equipment maintenance and software	395,000	504,000	648,000	826,000
Credit card merchant discount fees	485,000	388,000	935,000	770,000
Rent expenses	90,000	170,000	162,000	342,000
Accounting and legal fees	144,000	202,000	494,000	458,000
Other general and administrative expenses	502,000	846,000	1,059,000	2,646,000
Total operating expenses	12,665,000	13,454,000	23,400,000	26,649,000
Income (loss) from operations	1,305,000	(1,098,000)	990,000	(2,616,000)
Other income (expense)
Dividends and interest income	649,000	1,297,000	1,287,000	2,977,000
Realized gains on sales of marketable securities	18,478,000	0	18,478,000	0
Net unrealized losses on marketable securities	(5,144,000)	(77,211,000)	76,068,000	(57,680,000)
Interest expense on debt	(64,000)		(128,000)
Income (loss) before income taxes	15,211,000	(77,186,000)	96,661,000	(57,696,000)
Income tax (provisions) benefits	(2,735,000)	20,860,000	(24,915,000)	15,580,000
Net income (loss)	$ 12,476,000	$ (56,326,000)	$ 71,746,000	$ (42,116,000)
Weighted average number of common shares outstanding - basic and diluted (in shares)	1,380,746	1,380,746	1,380,746	1,380,746
Basic and diluted net income (loss) per share (in dollars per share)	$ 9.04	$ (40.79)	$ 51.96	$ (30.50)
Comprehensive income (loss)	$ 12,476,000	$ (56,326,000)	$ 71,746,000	$ (42,116,000)
Other income			0	3,000
Net unrealized gains on marketable securities			76,068,000	(57,680,000)
Real Estate Bank Loan Secured by Logan Office [Member]
Other income (expense)
Interest expense on debt	(13,000)	(21,000)	(34,000)	(43,000)
Margin Account [Member]
Other income (expense)
Interest expense on debt	(64,000)	(153,000)	(128,000)	(337,000)
Advertising [Member]
Revenues
Revenue from Contract with Customer, Including Assessed Tax	1,762,000	1,992,000	3,454,000	4,118,000
Subscription and Circulation [Member]
Revenues
Revenue from Contract with Customer, Including Assessed Tax	1,129,000	1,286,000	2,332,000	2,598,000
Advertising Service Fees and Other [Member]
Revenues
Revenue from Contract with Customer, Including Assessed Tax	568,000	654,000	1,202,000	1,348,000
License and Maintenance [Member]
Revenues
Revenue from Contract with Customer, Including Assessed Tax	6,355,000	5,505,000	11,388,000	10,715,000
Consulting Fees [Member]
Revenues
Revenue from Contract with Customer, Including Assessed Tax	2,305,000	1,229,000	2,549,000	1,918,000
Service, Other [Member]
Revenues
Revenue from Contract with Customer, Including Assessed Tax	$ 1,851,000	$ 1,690,000	$ 3,465,000	$ 3,336,000