Note 3 - Investments	12 Months Ended
Dec. 31, 2020
Notes to Financial Statements
Investment [Text Block]	Note 3. Investments At December 31, 2020 and 2019, the fair value of our non-current investments was $15.1 million and $6.2 million, respectively. Our non-current investments consist of marketable equity securities which are carried at fair value. The cost basis of our non-current investments was approximately $9.9 million and $9.8 million at December 31, 2020 and 2019, respectively. We acquired marketable equity securities having a cost basis of $2.2 million in 2020. We acquired marketable equity securities having a cost basis of $2.7 million, including $2.3 million in securities received for the sale of our interest in an exploration project, in 2019. In December 2020, we reclassified from non-current investments to other current assets $4.2 million for the value of marketable equity securities that were exchanged for cash and common shares of other companies in January 2021. During 2020 and 2019, we recognized $10.3 million in net unrealized gains and $2.4 million in net unrealized losses, respectively, in current earnings.

Note 3 - Investments

12 Months Ended

Dec. 31, 2020

Note 3. Investments

At December 31, 2020 and 2019, the fair value of our non-current investments was $15.1 million and $6.2 million, respectively. Our non-current investments consist of marketable equity securities which are carried at fair value. The cost basis of our non-current investments was approximately $9.9 million and $9.8 million at December 31, 2020 and 2019, respectively. We acquired marketable equity securities having a cost basis of $2.2 million in 2020. We acquired marketable equity securities having a cost basis of $2.7 million, including $2.3 million in securities received for the sale of our interest in an exploration project, in 2019. In December 2020, we reclassified from non-current investments to other current assets $4.2 million for the value of marketable equity securities that were exchanged for cash and common shares of other companies in January 2021. During 2020 and 2019, we recognized $10.3 million in net unrealized gains and $2.4 million in net unrealized losses, respectively, in current earnings.