Note 12 - Operating Segments - Summarized Financial Information for Reportable Segments (Details) - USD ($)	1 Months Ended		3 Months Ended				6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Advertising			$ 16,154,000		$ 10,949,000		$ 28,455,000	$ 22,685,000
Salaries and employee benefits			10,005,000		8,847,000		19,636,000	17,324,000
Decrease to the long-term supplemental compensation accrual			(200,000)		(1,920,000)		(720,000)	(2,050,000)
Others			4,724,000		3,649,000		8,630,000	6,982,000
Total operating expenses			14,529,000		10,576,000		27,546,000	22,256,000
Income (loss) from operations			1,625,000		373,000		909,000	429,000
Dividends and interest income			4,063,000		2,113,000		5,132,000	2,988,000
Realized losses on sales of marketable securities	$ 422,000	$ 14,249,000	0		(32,445,000)		422,000	14,249,000
Net unrealized gains (losses) on marketable securities			8,644,000		(8,321,000)		32,669,000	(44,409,000)
Pretax income (loss)			13,268,000		(38,443,000)		37,195,000	(27,005,000)
Income tax (provisions) benefits			(3,835,000)		10,630,000		(9,935,000)	6,070,000
Net income			9,433,000	$ 17,827,000	(27,813,000)	$ 6,878,000	27,260,000	(20,935,000)
Total assets			359,020,000		390,090,000		359,020,000	390,090,000	$ 319,111,000
Capital expenditures			38,000		3,000		74,000	3,000
Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on margin loans and others			(12,000)		(13,000)		(24,000)	(26,000)
Margin Account [Member]
Interest expense on margin loans and others			(1,052,000)		(150,000)		(1,913,000)	(236,000)
Advertising [Member]
Advertising			2,204,000		2,129,000		4,194,000	4,130,000
Subscription and Circulation [Member]
Advertising			1,108,000		1,072,000		2,206,000	2,182,000
Advertising Service Fees and Other [Member]
Advertising			778,000		742,000		1,477,000	1,413,000
License and Maintenance [Member]
Advertising			5,679,000		4,608,000		10,074,000	9,088,000
Consulting Fees [Member]
Advertising			4,433,000		669,000		6,755,000	2,430,000
Service, Other [Member]
Advertising			1,952,000		1,729,000		3,749,000	3,442,000
Traditional Business [Member]
Advertising			4,090,000		3,943,000		7,877,000	7,725,000
Journal Technologies [Member]
Advertising			12,064,000		7,006,000		20,578,000	14,960,000
Operating Segments [Member] | Traditional Business [Member]
Advertising			4,090,000		3,943,000		7,877,000	7,725,000
Salaries and employee benefits			2,281,000		2,415,000		4,499,000	4,730,000
Decrease to the long-term supplemental compensation accrual			(200,000)		(1,920,000)		(700,000)	(2,010,000)
Others			1,301,000		1,362,000
Total operating expenses			3,382,000		1,857,000		6,234,000	5,133,000
Income (loss) from operations			708,000		2,086,000		1,643,000	2,592,000
Pretax income (loss)			708,000		2,086,000		1,643,000	2,592,000
Income tax (provisions) benefits			(200,000)		(355,000)		(435,000)	(560,000)
Net income			508,000		1,731,000		1,208,000	2,032,000
Total assets			14,053,000		19,924,000		14,053,000	19,924,000
Capital expenditures			38,000				70,000
Operating Segments [Member] | Traditional Business [Member] | Advertising [Member]
Advertising			2,204,000		2,129,000		4,194,000	4,130,000
Operating Segments [Member] | Traditional Business [Member] | Subscription and Circulation [Member]
Advertising			1,108,000		1,072,000		2,206,000	2,182,000
Operating Segments [Member] | Traditional Business [Member] | Advertising Service Fees and Other [Member]
Advertising			778,000		742,000		1,477,000	1,413,000
Operating Segments [Member] | Journal Technologies [Member]
Advertising			12,064,000		7,006,000		20,578,000	14,960,000
Salaries and employee benefits			7,724,000		6,432,000		15,137,000	12,594,000
Decrease to the long-term supplemental compensation accrual							(20,000)	(40,000)
Others			3,423,000		2,287,000		6,195,000	4,569,000
Total operating expenses			11,147,000		8,719,000		21,312,000	17,123,000
Income (loss) from operations			917,000		(1,713,000)		(734,000)	(2,163,000)
Pretax income (loss)			917,000		(1,713,000)		(734,000)	(2,163,000)
Income tax (provisions) benefits			(215,000)		455,000		135,000	705,000
Net income			702,000		(1,258,000)		(599,000)	(1,458,000)
Total assets			25,444,000		15,830,000		25,444,000	15,830,000
Capital expenditures					3,000		4,000	3,000
Operating Segments [Member] | Journal Technologies [Member] | License and Maintenance [Member]
Advertising			5,679,000		4,608,000		10,074,000	9,088,000
Operating Segments [Member] | Journal Technologies [Member] | Consulting Fees [Member]
Advertising			4,433,000		669,000		6,755,000	2,430,000
Operating Segments [Member] | Journal Technologies [Member] | Service, Other [Member]
Advertising			1,952,000		1,729,000		3,749,000	3,442,000
Corporate, Non-Segment [Member]
Dividends and interest income			4,063,000		2,113,000		5,132,000	2,988,000
Realized losses on sales of marketable securities					(32,445,000)		422,000	14,249,000
Net unrealized gains (losses) on marketable securities			8,644,000		(8,321,000)		32,669,000	(44,409,000)
Pretax income (loss)			11,643,000		(38,816,000)
Income tax (provisions) benefits			(3,420,000)		10,530,000		(9,635,000)	5,925,000
Net income			8,223,000		(28,286,000)		26,651,000	(21,509,000)
Total assets			319,523,000		354,336,000		319,523,000	354,336,000
Corporate, Non-Segment [Member] | Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on margin loans and others			(12,000)		(13,000)		$ (24,000)	(26,000)
Corporate, Non-Segment [Member] | Margin Account [Member]
Interest expense on margin loans and others			$ (1,052,000)		$ (150,000)			$ (236,000)