Note 12 - Operating Segments - Summarized Financial Information for Reportable Segments (Details) - USD ($)	1 Months Ended		3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax			$ 12,301,000	$ 11,736,000
Salaries and employee benefits			9,631,000	8,477,000
Decrease to the long-term supplemental compensation accrual			(520,000)	(130,000)
Others			3,906,000	3,333,000
Total operating expenses			13,017,000	11,680,000
Income (loss) from operations			(716,000)	56,000
Dividends and interest income			1,069,000	875,000
Realized gains on sales of marketable securities	$ 422,000	$ 46,694,000	422,000	46,694,000
Marketable Securities, Unrealized Gain (Loss)			24,025,000	(36,088,000)
Pretax income (loss)			23,927,000	11,438,000
Income tax provisions			(6,100,000)	(4,560,000)
Net income			17,827,000	6,878,000
Total assets	346,271,000	436,007,000	346,271,000	436,007,000	$ 319,111,000
Capital expenditures			36,000
Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on debt			(12,000)	(13,000)
Margin Account [Member]
Interest expense on debt			(861,000)	(86,000)
Advertising [Member]
Revenue from Contract with Customer, Including Assessed Tax			1,990,000	2,001,000
Subscription and Circulation [Member]
Revenue from Contract with Customer, Including Assessed Tax			1,098,000	1,110,000
Advertising Service Fees and Other [Member]
Revenue from Contract with Customer, Including Assessed Tax			699,000	671,000
License and Maintenance [Member]
Revenue from Contract with Customer, Including Assessed Tax			4,395,000	4,480,000
Consulting Fees [Member]
Revenue from Contract with Customer, Including Assessed Tax			2,322,000	1,761,000
Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax			1,797,000	1,713,000
Traditional Business [Member]
Revenue from Contract with Customer, Including Assessed Tax			3,787,000	3,782,000
Journal Technologies [Member]
Revenue from Contract with Customer, Including Assessed Tax			8,514,000	7,954,000
Operating Segments [Member] | Traditional Business [Member]
Revenue from Contract with Customer, Including Assessed Tax			3,787,000	3,782,000
Salaries and employee benefits			2,218,000	2,315,000
Decrease to the long-term supplemental compensation accrual			(500,000)	(90,000)
Others			1,134,000	1,051,000
Total operating expenses			2,852,000	3,276,000
Income (loss) from operations			935,000	506,000
Pretax income (loss)			935,000	506,000
Income tax provisions			(235,000)	(205,000)
Net income			700,000	301,000
Total assets	45,288,000	69,925,000	45,288,000	69,925,000
Operating Segments [Member] | Traditional Business [Member] | Advertising [Member]
Revenue from Contract with Customer, Including Assessed Tax			1,990,000	2,001,000
Operating Segments [Member] | Traditional Business [Member] | Subscription and Circulation [Member]
Revenue from Contract with Customer, Including Assessed Tax			1,098,000	1,110,000
Operating Segments [Member] | Traditional Business [Member] | Advertising Service Fees and Other [Member]
Revenue from Contract with Customer, Including Assessed Tax			699,000	671,000
Operating Segments [Member] | Journal Technologies [Member]
Revenue from Contract with Customer, Including Assessed Tax			8,514,000	7,954,000
Salaries and employee benefits			7,413,000	6,162,000
Decrease to the long-term supplemental compensation accrual			(20,000)
Others			2,772,000	2,282,000
Total operating expenses			10,165,000	8,404,000
Income (loss) from operations			(1,651,000)	(450,000)
Pretax income (loss)			(1,651,000)	(450,000)
Income tax provisions			350,000	250,000
Net income			(1,301,000)	(200,000)
Total assets	25,202,000	18,925,000	25,202,000	18,925,000
Capital expenditures			4,000
Operating Segments [Member] | Journal Technologies [Member] | License and Maintenance [Member]
Revenue from Contract with Customer, Including Assessed Tax			4,395,000	4,480,000
Operating Segments [Member] | Journal Technologies [Member] | Consulting Fees [Member]
Revenue from Contract with Customer, Including Assessed Tax			2,322,000	1,761,000
Operating Segments [Member] | Journal Technologies [Member] | Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax			1,797,000	1,713,000
Corporate, Non-Segment [Member]
Dividends and interest income			1,069,000	875,000
Realized gains on sales of marketable securities			422,000	46,694,000
Marketable Securities, Unrealized Gain (Loss)			24,025,000	(36,088,000)
Pretax income (loss)			24,643,000	11,382,000
Income tax provisions			(6,215,000)	(4,605,000)
Net income			18,428,000	6,777,000
Total assets	$ 275,781,000	$ 347,157,000	275,781,000	347,157,000
Corporate, Non-Segment [Member] | Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on debt			(12,000)	(13,000)
Corporate, Non-Segment [Member] | Margin Account [Member]
Interest expense on debt			$ (861,000)	$ (86,000)