The average realized silver price per ounce.

No definition available.

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- Definition

The minimum average realized silver price per ounce that must be met for the silver-price-linked component of dividends to be declared.

+ References

No definition available.

+ Details

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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

+ Details

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

+ Details

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- Definition

Net number of share options (or share units) granted during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

+ Details

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Note 8 - Shareholders' Equity (Details) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended
Note 8 - Shareholders' Equity (Details) (USD $)	Mar. 05, 2015	Mar. 31, 2015	Dec. 31, 2014	May 06, 2015	Mar. 31, 2014	May 08, 2012
Note 8 - Shareholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in Shares)	911,148
Allocated Share-based Compensation Expense			$ 3,000,000
undefined (in Dollars per Ounce)		17.18hl_AverageRealizedSilverPrice
Average Realized Silver Price, Minimum Dividend Threshold (in Dollars per Ounce)		30
Subsequent Event [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Common Stock, Dividends, Per Share, Declared (in Dollars per share)				$ 0.0025
Dividends, Common Stock				900,000
Satisfy Withholding Obligations [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Stock Repurchased During Period, Shares (in Shares)		284,243
Stock Repurchased During Period, Value		941,000
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)		$ 3.31
Restricted Stock Units (RSUs) [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Allocated Share-based Compensation Expense		1,100,000			1,100,000
Common Stock Repurchase Program [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)		$ 3.99
Stock Repurchase Program, Authorized Amount						$ 20,000,000
Cumulative Stock Repurchased (in Shares)		934,100
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in Shares)		19,100,000
Minimum [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Common Stock, Dividends, Per Share, Declared (in Dollars per share)		$ 0.01