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Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Table Text Block]

	December 31,
	2016		2015
Mining properties, including asset retirement obligations	$	403,935	$	372,935
Development costs		347,356		291,780
Plants and equipment		814,091		738,065
Land		26,229		21,362
Mineral interests		952,382		907,791
Construction in progress		330,785		295,155
		2,874,778		2,627,088
Less accumulated depreciation, depletion and amortization		842,093		730,277
Net carrying value	$	2,032,685	$	1,896,811

Operating Leases of Lessee Disclosure [Table Text Block]

Year ending December 31,
2017	$	4,571
2018		2,466
2019		976
2020		993
2021		653
Thereafter		634
Total	$	10,293

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

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