Note 9 - Equity - Options (Details)					1 Months Ended		3 Months Ended	12 Months Ended			36 Months Ended
	Dec. 15, 2023 USD ($) $ / shares	Sep. 15, 2023 USD ($) $ / shares	Jun. 21, 2023 USD ($) shares	Aug. 31, 2016 item $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
EQUITY
Authorized (in shares)					10,900,000			10,900,000			10,900,000
Shares available for grant					4,600,000			4,600,000			4,600,000
Compensation costs | $								$ 12,900,000	$ 8,200,000	$ 5,300,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Options granted				937,424
Option exercise price (per share) | $ / shares				$ 5.34
Number of executives | item				2
Options outstanding, intrinsic value | $					$ 10,900,000			$ 10,900,000			$ 10,900,000
Shares delivered per unit awarded								1
Common stock, shares authorized (in shares)						260,000,000			260,000,000
Common stock, par value (in dollars per share) | $ / shares					$ 0.01	$ 0.01		$ 0.01	$ 0.01		$ 0.01
Preferred stock, shares authorized (in shares)					50,000,000	50,000,000		50,000,000	50,000,000		50,000,000
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.01	$ 0.01		$ 0.01	$ 0.01		$ 0.01
Fair value of awards | $								$ 19,700,000	$ 11,000,000.0	5,100,000
Incremental compensation costs associated with modifications | $			$ 0
Payment of dividends | $						$ 5,500,000		25,800,000	20,000,000.0
Cash dividends declared | $					$ 6,000,000.0			$ 27,500,000	$ 23,064,000	2,501,000
Dividend payable per share | $ / shares						$ 0.52			$ 0.52
Quarterly dividend per share | $ / shares					$ (0.125)			$ (0.125)			$ (0.125)
Dividend payable | $					$ 7,198,000	$ 5,524,000		$ 7,198,000	$ 5,524,000	2,501,000	$ 7,198,000
Class A Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Common stock, shares authorized (in shares)					225,000,000			225,000,000			225,000,000
Common stock, par value (in dollars per share) | $ / shares					$ 0.01			$ 0.01			$ 0.01
Dividends paid | $ / shares								$ 16,600,000
Dividends paid amount | $								$ 6,000,000.0
Dividend payable per share | $ / shares					0.375			$ 0.375			0.375
Quarterly dividend per share | $ / shares					$ 0.125			$ 0.125			$ 0.125
Class B Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Common stock, shares authorized (in shares)					35,000,000			35,000,000			35,000,000
Common stock, par value (in dollars per share) | $ / shares					$ 0.01			$ 0.01			$ 0.01
Dividends paid | $ / shares	$ 0.249	$ 0.165
Dividend payable | $	$ 2,200,000	$ 1,500,000
Employee Stock Option [Member]
EQUITY
Compensation costs | $								$ 0	$ 0	$ 0	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Options exercised							20,000
Balance options							917,424
Options exercised, intrinsic value | $							$ 124,000	$ 2,600,000
Expiration period				10 years
Employee Stock Option [Member] | Class A Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Options exercised								168,712
Options outstanding and unexercised					748,712			748,712			748,712
Employee Stock Option [Member] | Class B Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Options granted								183,484
Options exercised								33,742
Options outstanding and unexercised					149,742			149,742			149,742
Restricted Stock | Class A Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, Weighted average grant date fair value (in dollars per share) | $ / shares					$ 5.66	$ 4.04		$ 5.66	$ 4.04	$ 3.98	$ 5.66
Outstanding, shares (in shares)					1,708,354	3,145,957		1,708,354	3,145,957	3,741,770	1,708,354
Granted (in shares)								296,115	214,363
Fair value of awards | $								$ 14,600,000
Outstanding, fair value | $								$ 29,300,000
Restricted Stock | Class B Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, shares (in shares)			680,718		341,683			341,683			341,683
Fair value of awards | $								$ 3,600,000
Outstanding, fair value | $								4,500,000
Restricted Stock | Executives and Employees
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Unrecognized compensation cost | $					$ 3,200,000			$ 3,200,000			$ 3,200,000
Weighted-average period for recognition								1 year 4 months 24 days
Restricted Stock | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Vesting period								1 year
Restricted Stock | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Vesting period								3 years 6 months
Restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Vesting period								3 years
Unrecognized compensation cost | $					$ 5,200,000			$ 5,200,000			$ 5,200,000
Weighted-average period for recognition								1 year 8 months 12 days
Delivery Period								30 days
Restricted Stock Units | Class A Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, Weighted average grant date fair value (in dollars per share) | $ / shares					$ 11.30	$ 15.65		$ 11.30	$ 15.65		$ 11.30
Outstanding, shares (in shares)					601,248	165,803		601,248	165,803		601,248
Granted (in shares)								518,348	248,706
Fair value of awards | $								$ 1,300,000
Outstanding, fair value | $								$ 10,300,000
Restricted Stock Units | Class B Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, shares (in shares)			136,819		120,241			120,241			120,241
Fair value of awards | $								$ 200,000
Outstanding, fair value | $								$ 1,600,000
Performance Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Vesting period								3 years
Unrecognized compensation cost | $					$ 8,900,000			$ 8,900,000			$ 8,900,000
Weighted-average period for recognition								1 year 8 months 12 days
Intrinsic value of the outstanding | $					$ 15,200,000			$ 15,200,000			$ 15,200,000
Delivery Period								30 days
Shares delivered per unit awarded								1
Outstanding, fair value | $								$ 27,000,000
Performance Stock Units | Class A Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, Weighted average grant date fair value (in dollars per share) | $ / shares					$ 19.43	$ 22.21		$ 19.43	$ 22.21	$ 22.21	$ 19.43
Outstanding, shares (in shares)					767,054	248,706		767,054	248,706		767,054
Granted (in shares)								518,348	248,706
Performance Stock Units | Class B Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, shares (in shares)			153,404		153,404			153,404			153,404
Performance Stock Units | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Potential earnings (as a percentage)								0.00%
Performance Stock Units | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Potential earnings (as a percentage)								200.00%