Note 17 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 17, 2024	Nov. 02, 2023	Feb. 28, 2024	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Jun. 29, 2025
Gain (Loss) on Investments				$ 505		$ 110	$ 673	$ 227
Common Class B [Member]
Treasury Stock, Value, Acquired, Cost Method							42,600		$ 37,500
Howard Jonas [Member]
Related Party Transaction, Amounts of Transaction					$ 900
Howard Jonas [Member] | Common Class B [Member]
Stock Issued During Period, Shares, New Issues (in shares)			49,632
Genie Foundation [Member] | Common Class B [Member]
Stock Issued During Period, Shares, New Issues (in shares)		50,000
Stock Issued During Period, Value, Treasury Stock Reissued		$ 1,000
Treasury Stock, Shares, Acquired (in shares)	50,000
Treasury Stock, Value, Acquired, Cost Method	$ 800
Rafael Holdings, Inc [Member]
Gain (Loss) on Investments				$ 100		$ (100)	$ 100	$ (100)
Rafael Holdings, Inc [Member] | Common Class B [Member]
Investment Owned, Balance, Shares (in shares)				346,877			346,877			130,484
Investment Owned, Cost										$ 200
Investments				$ 400			$ 400
IGM Brokerage Corp [Member] | Insurance [Member]
Related Party Transaction, Amounts of Transaction							$ 0		$ 400