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Note 9 - Investments in Marketable Securities (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Equity Securities Fv Ni Gross Unrealized Gain $ 116,906,000   $ 110,081,000
Equity Securities Fv Ni Gross Unrealized Loss 21,000   34,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,089,000   335,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,338,000   3,809,000
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total 0   $ 0
Proceeds from Sale of Debt Securities, Available-for-sale 6,576,000 $ 3,535,000  
Realized Investment Gains (Losses), Total 0 11,000  
Proceeds from Sale and Maturity of Marketable Securities, Total 0 0  
Equity Securities, FV-NI, Unrealized Gain (Loss), Total $ 6,838,000 $ (15,517,000)