Note 5 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2021 shares
Capital Units, Authorized (in shares)	245,000,000
Common Stock, Shares Authorized (in shares)	200,000,000
Preferred Stock, Shares Authorized (in shares)	20,000,000
Common Stock, Voting Rights, Votes Per Share	1
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares	$ 0.08	$ 0.08
Dividends, Common Stock, Total | $	$ 8,000	$ 8,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	2,071,292		2,821,480
Class A Common Stock (No Par Value) [Member]
Common Stock, Shares Authorized (in shares)	25,000,000		25,000,000
Common Stock, Voting Rights, Votes Per Share	10
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	597,074		847,522
Common Stock and Class A Common Stock [Member]
Treasury Stock, Value, Acquired, Cost Method | $	$ 0
Stock Repurchase Program, Authorized Amount | $	$ 174,000