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Note 1 - Significant Accounting Policies and Recent Accounting Pronouncements (Details Textual) $ / shares in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Aug. 27, 2020 a	Dec. 31, 2019 USD ($)
Equity Securities, FV-NI	$ 502,847			$ 500,642
Accounts Receivable, Allowance for Credit Loss, Current	0
Impairment of Long-Lived Assets Held-for-use	0	$ 0
Accrued Royalty Income	77,651			84,880
Deposit Assets, Stumpage Agreements	$ 137,300			87,300
Earnings Per Share, Diluted, Total (in dollars per share) | $ / shares	$ 0	$ 0
Payments of Ordinary Dividends, Common Stock	$ 0	$ 0
Surface Leases [Member] | Accounts Payable and Accrued Liabilities [Member]
Contract with Customer, Liability, Total	111,311			77,857
Southwest Louisiana [Member]
Area of Land (Acre) | a			13,944
Southwest Louisiana [Member] | Timber Properties [Member]
Area of Land (Acre) | a			10,522
Mutual Fund [Member]
Equity Securities, FV-NI	$ 502,847			$ 500,642

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