Note 11 - Operating Segments - Summarized Financial Information for Reportable Segments (Details) - USD ($)	1 Months Ended	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax		$ 11,528,000	$ 10,420,000
Salaries and employee benefits		8,347,000	7,892,000
Others		3,125,000	2,843,000
Total operating expenses		11,472,000	10,735,000
Income (loss) from operations		56,000	(315,000)
Dividends and interest income		875,000	638,000
Realized gains on sales of marketable securities	$ 46,694,000	46,694,000	0
Marketable Securities, Unrealized Gain (Loss), Total		(36,088,000)	81,212,000
Pretax income (loss)		11,438,000	81,450,000
Income tax provisions		(4,560,000)	(22,180,000)
Net income		6,878,000	59,270,000
Total assets	436,007,000	436,007,000	303,343,000	$ 390,577,000
Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on debt		(13,000)	(21,000)
Margin Account [Member]
Interest expense on debt		(86,000)	(64,000)
Advertising [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,794,000	1,692,000
Subscription and Circulation [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,110,000	1,203,000
Advertising Service Fees and Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		670,000	634,000
License and Maintenance [Member]
Revenue from Contract with Customer, Including Assessed Tax		4,480,000	5,033,000
Consulting Fees [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,761,000	244,000
Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,713,000	1,614,000
Traditional Business [Member]
Revenue from Contract with Customer, Including Assessed Tax		3,574,000	3,529,000
Journal Technologies [Member]
Revenue from Contract with Customer, Including Assessed Tax		7,954,000	6,891,000
Operating Segments [Member] | Traditional Business [Member]
Revenue from Contract with Customer, Including Assessed Tax		3,574,000	3,529,000
Salaries and employee benefits		2,225,000	1,920,000
Others		843,000	1,061,000
Total operating expenses		3,068,000	2,981,000
Income (loss) from operations		506,000	548,000
Pretax income (loss)		506,000	548,000
Income tax provisions		(205,000)	(110,000)
Net income		301,000	438,000
Total assets	21,984,000	21,984,000	21,799,000
Operating Segments [Member] | Traditional Business [Member] | Advertising [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,794,000	1,692,000
Operating Segments [Member] | Traditional Business [Member] | Subscription and Circulation [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,110,000	1,203,000
Operating Segments [Member] | Traditional Business [Member] | Advertising Service Fees and Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		670,000	634,000
Operating Segments [Member] | Journal Technologies [Member]
Revenue from Contract with Customer, Including Assessed Tax		7,954,000	6,891,000
Salaries and employee benefits		6,122,000	5,972,000
Others		2,282,000	1,782,000
Total operating expenses		8,404,000	7,754,000
Income (loss) from operations		(450,000)	(863,000)
Pretax income (loss)		(450,000)	(863,000)
Income tax provisions		250,000	405,000
Net income		(200,000)	(458,000)
Total assets	18,925,000	18,925,000	19,923,000
Operating Segments [Member] | Journal Technologies [Member] | License and Maintenance [Member]
Revenue from Contract with Customer, Including Assessed Tax		4,480,000	5,033,000
Operating Segments [Member] | Journal Technologies [Member] | Consulting Fees [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,761,000	244,000
Operating Segments [Member] | Journal Technologies [Member] | Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,713,000	1,614,000
Corporate, Non-Segment [Member]
Dividends and interest income		875,000	638,000
Realized gains on sales of marketable securities		46,694,000
Marketable Securities, Unrealized Gain (Loss), Total		(36,088,000)	81,212,000
Pretax income (loss)		11,382,000	81,765,000
Income tax provisions		(4,605,000)	(22,475,000)
Net income		6,777,000	59,290,000
Total assets	$ 395,098,000	395,098,000	261,621,000
Corporate, Non-Segment [Member] | Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on debt		(13,000)	(21,000)
Corporate, Non-Segment [Member] | Margin Account [Member]
Interest expense on debt		$ (86,000)	$ (64,000)