XML 44 R10.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Note 3 - Investments | 12 Months Ended
--- | ---
Dec. 31, 2018
Notes to Financial Statements |
Investments and Restricted Cash Disclosure [Text Block] | Note 3. Investments Investments Our current investments, which are classified as "available for sale" and consist of bonds having maturities of greater than 90 days, were $33.8 million at December 31, 2017. We held no such investments as of December 31, 2018. During 2018 and 2017, we had purchases of such investments of $31.2 million and $55.0 million, respectively, and maturities of $64.9 million and $50.0 million, respectively. Our current investments at December 31, 2017 consisted of the following (in thousands):
|  | December 31, 2017 |
|  | Amortized cost |  |  | Unrealized loss |  |  | Fair market value |
Corporate bonds |  | $ | 33,778 |  |  | $ | (20 | ) |  | $ | 33,758 |
At December 31, 2018 and 2017, the fair value of our non-current investments was $6.6 million and $7.6 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 $7.7 million and $5.7 million at December 31, 2018 and 2017, respectively. In 2018 and 2017, we acquired marketable equity securities having a cost basis of $2.4 million and $1.6 million, respectively. During 2018, we recognized $2.8 million in net unrealized losses in current earnings. During 2017, we recognized $2.1 million in net unrealized gains in other comprehensive income and $0.2 million in net unrealized losses in current earnings.

X
- Definition The entire disclosure for investments and restricted cash. + References No definition available. + Details
Name: | hl_InvestmentsAndRestrictedCashDisclosureTextBlock
Namespace Prefix: | hl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration