Note 10 - Shareholders' Equity (Details Textual)	12 Months Ended
	Dec. 31, 2024 $ / shares shares	Dec. 31, 2023 shares	Dec. 31, 2019 shares
Preferred Stock, Shares Authorized (in shares)			1,000,000
Treasury Stock Shares Acquired on the Open Market (in shares)	1,512
Common Class A [Member]
Common Stock, Shares Authorized (in shares)	10,000,000	10,000,000	10,000,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	1,002,848
Common Stock, Voting Rights, per Share	1
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares	$ 0.1
Common Class B [Member]
Common Stock, Shares Authorized (in shares)	2,500,000	2,500,000	2,500,000
Common Stock, Voting Rights, per Share	3