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Note 1 - Significant Accounting Policies and Recent Accounting Pronouncements (Details Textual) - USD ($)
$ / shares in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Equity Securities, FV-NI $ 249,436   $ 244,825
Accounts Receivable, Allowance for Credit Loss, Current 0   0
Impairment of Long-Lived Assets Held-for-use 0    
Accrued Royalty Income 111,915   93,594
Deposit Assets, Stumpage Agreements $ 54,300   54,300
Earnings Per Share, Diluted, Total $ 0 $ 0  
Payments of Ordinary Dividends, Common Stock $ 0 $ 233,099  
Oil and Gas [Member]      
Capitalized Contract Cost, Net, Total 0    
Timber [Member]      
Capitalized Contract Cost, Net, Total 0    
Surface Leases [Member] | Accounts Payable and Accrued Liabilities [Member]      
Contract with Customer, Liability, Total 94,741   58,893
Mutual Fund [Member]      
Equity Securities, FV-NI $ 249,436   $ 244,825