Note 12 - Operating Segments - Summarized Financial Information for Reportable Segments (Details) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Sep. 30, 2023
Revenue	$ 15,993,000	$ 12,301,000
Salaries and employee benefits	11,347,000	9,631,000
Decrease to the long-term supplemental compensation accrual	(420,000)	(520,000)
Others	4,443,000	3,906,000
Total operating expenses	15,370,000	13,017,000
Income (loss) from operations	623,000	(716,000)
Dividends and interest income	1,569,000	1,069,000
Realized gains on sales of marketable securities	0	422,000
Net unrealized gains on marketable securities	14,690,000	24,025,000		$ (24,025,000)
Pretax income (loss)	15,740,000	23,927,000
Income tax provisions	(3,125,000)	(6,100,000)
Net income	12,615,000	17,827,000
Total assets	357,363,000	346,271,000		$ 354,860,000
Capital expenditures	5,000	36,000
Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on margin loans and others	(11,000)	(12,000)
Margin Account [Member]
Interest expense on margin loans and others	(1,131,000)	(861,000)
Advertising [Member]
Revenue	2,087,000	1,990,000
Subscription and Circulation [Member]
Revenue	1,095,000	1,098,000
Advertising Service Fees and Other [Member]
Revenue	705,000	699,000
License and Maintenance [Member]
Revenue	6,557,000	4,395,000
Consulting Fees [Member]
Revenue	3,302,000	2,322,000
Service, Other [Member]
Revenue	2,247,000	1,797,000
Traditional Business [Member]
Revenue	3,887,000		$ 3,787,000
Journal Technologies [Member]
Revenue	12,106,000		$ 8,514,000
Operating Segments [Member] | Traditional Business [Member]
Revenue	3,887,000	3,787,000
Salaries and employee benefits	2,549,000	2,218,000
Decrease to the long-term supplemental compensation accrual	(420,000)	(500,000)
Others	1,471,000	1,134,000
Total operating expenses	3,600,000	2,852,000
Income (loss) from operations	287,000	935,000
Dividends and interest income	0	0
Realized gains on sales of marketable securities	0	0
Net unrealized gains on marketable securities	0	0
Pretax income (loss)	287,000	935,000
Income tax provisions	(55,000)	(235,000)
Net income	232,000	700,000
Total assets	15,483,000	45,288,000
Capital expenditures	5,000	32,000
Operating Segments [Member] | Traditional Business [Member] | Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on margin loans and others	0	0
Operating Segments [Member] | Traditional Business [Member] | Margin Account [Member]
Interest expense on margin loans and others	0	0
Operating Segments [Member] | Traditional Business [Member] | Advertising [Member]
Revenue	2,087,000	1,990,000
Operating Segments [Member] | Traditional Business [Member] | Subscription and Circulation [Member]
Revenue	1,095,000	1,098,000
Operating Segments [Member] | Traditional Business [Member] | Advertising Service Fees and Other [Member]
Revenue	705,000	699,000
Operating Segments [Member] | Traditional Business [Member] | License and Maintenance [Member]
Revenue	0	0
Operating Segments [Member] | Traditional Business [Member] | Consulting Fees [Member]
Revenue	0	0
Operating Segments [Member] | Traditional Business [Member] | Service, Other [Member]
Revenue	0	0
Operating Segments [Member] | Journal Technologies [Member]
Revenue	12,106,000	8,514,000
Salaries and employee benefits	8,798,000	7,413,000
Decrease to the long-term supplemental compensation accrual	0	(20,000)
Others	2,972,000	2,772,000
Total operating expenses	11,770,000	10,165,000
Income (loss) from operations	336,000	(1,651,000)
Dividends and interest income	0	0
Realized gains on sales of marketable securities	0	0
Net unrealized gains on marketable securities	0	0
Pretax income (loss)	336,000	(1,651,000)
Income tax provisions	(250,000)	350,000
Net income	86,000	(1,301,000)
Total assets	24,062,000	25,202,000
Capital expenditures	0	4,000
Operating Segments [Member] | Journal Technologies [Member] | Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on margin loans and others	0	0
Operating Segments [Member] | Journal Technologies [Member] | Margin Account [Member]
Interest expense on margin loans and others	0	0
Operating Segments [Member] | Journal Technologies [Member] | Advertising [Member]
Revenue	0	0
Operating Segments [Member] | Journal Technologies [Member] | Subscription and Circulation [Member]
Revenue	0	0
Operating Segments [Member] | Journal Technologies [Member] | Advertising Service Fees and Other [Member]
Revenue	0	0
Operating Segments [Member] | Journal Technologies [Member] | License and Maintenance [Member]
Revenue	6,557,000	4,395,000
Operating Segments [Member] | Journal Technologies [Member] | Consulting Fees [Member]
Revenue	3,302,000	2,322,000
Operating Segments [Member] | Journal Technologies [Member] | Service, Other [Member]
Revenue	2,247,000	1,797,000
Corporate, Non-Segment [Member]
Revenue	0	0
Salaries and employee benefits	0	0
Decrease to the long-term supplemental compensation accrual	0	0
Others	0	0
Total operating expenses	0	0
Income (loss) from operations	0	0
Dividends and interest income	1,569,000	1,069,000
Realized gains on sales of marketable securities	0	422,000
Net unrealized gains on marketable securities	14,690,000	24,025,000
Pretax income (loss)	15,117,000	24,643,000
Income tax provisions	(2,820,000)	(6,215,000)
Net income	12,297,000	18,428,000
Total assets	317,818,000	275,781,000
Capital expenditures	0	0
Corporate, Non-Segment [Member] | Real Estate Bank Loan Secured by Logan Office [Member]
Interest expense on margin loans and others	(11,000)	(12,000)
Corporate, Non-Segment [Member] | Margin Account [Member]
Interest expense on margin loans and others	(1,131,000)	(861,000)
Corporate, Non-Segment [Member] | Advertising [Member]
Revenue	0	0
Corporate, Non-Segment [Member] | Subscription and Circulation [Member]
Revenue	0	0
Corporate, Non-Segment [Member] | Advertising Service Fees and Other [Member]
Revenue	0	0
Corporate, Non-Segment [Member] | License and Maintenance [Member]
Revenue	0	0
Corporate, Non-Segment [Member] | Consulting Fees [Member]
Revenue	0	0
Corporate, Non-Segment [Member] | Service, Other [Member]
Revenue	$ 0	$ 0