Note 6 - Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Number of Reportable Segments	2
Other Nonrecurring Expense	$ 1,498	$ 6,166
Lucky Friday [Member] | Depreciation Depletion and Amortization [Member]
Other Nonrecurring Expense	600
Lucky Friday [Member]
Other Nonrecurring Expense	$ 1,500