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Note 4 - Environmental and Reclamation Activities (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Accrued Liabilities [Table Text Block]

		2017				2016
Operating properties:
Greens Creek		$	41,677			$	39,014
Lucky Friday			9,911				9,194
Casa Berardi			6,729				5,475
San Sebastian			5,067				5,592
Non-operating properties:
Troy mine			12,724				16,167
Johnny M			5,813				5,830
Republic			1,500				1,500
All other sites			2,624				2,808
Total			86,045				85,580
Reclamation and closure costs, current			(6,679	)			(5,653	)
Reclamation and closure costs, long-term		$	79,366			$	79,927

Accrued Reclamation and Closure Cost Liability Activity [Table Text Block]

Balance at January 1, 2015		$	57,250
Accruals for estimated costs			15,114
Accretion expense			1,904
Revision of estimated cash flows due to changes in reclamation plans			4,112
Addition due to development and production at our San Sebastian unit			1,189
Liability addition due to acquisition of Revett			17,513
Payment of reclamation obligations			(1,544	)
Balance at December 31, 2015			95,538
Accruals for estimated costs			705
Accretion expense			3,158
Revision of estimated cash flows due to changes in reclamation plans			2,759
Liability addition due to acquisition of Mines Management			1,124
Payment of reclamation obligations			(17,704	)
Balance at December 31, 2016			85,580
Accruals for estimated costs			16
Accretion expense			4,870
Revision of estimated cash flows due to changes in reclamation plans			(578	)
Payment of reclamation obligations			(3,843	)
Balance at December 31, 2017		$	86,045

Schedule of Change in Asset Retirement Obligation [Table Text Block]

		2017				2016
Balance January 1		$	59,275			$	53,433
Changes in obligations due to changes in reclamation plans			(578	)			2,760
Accretion expense			4,870				3,158
Payment of reclamation obligations			(183	)			(76	)
Balance at December 31		$	63,384			$	59,275