Note 8 - Shareholders' Equity (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended
	Mar. 03, 2014	Feb. 28, 2012	Mar. 31, 2014	Mar. 31, 2013	May 02, 2014	May 08, 2012
Note 8 - Shareholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	1,345,072
Allocated Share-based Compensation Expense			$ 1,100,000	$ 800,000
Stock Repurchased During Period, Shares (in Shares)			400,300
Stock Repurchased During Period, Value			40,000
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)			$ 3.57
Common Stock, Dividends, Per Share, Declared (in Dollars per share)		$ 0.01	$ 0.0025
Dividends, Common Stock			900,000
Average Realized Silver Price			20,040,000
Payments of Dividends			995,000	138,000
			0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)						20,000,000
Accelerated Share Repurchases, Final Price Paid Per Share (in Dollars per share)			$ 5.56
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in Shares)			19,600,000
Share Price (in Dollars per share)					$ 3.11
Restricted Stock Units (RSUs) [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Allocated Share-based Compensation Expense			4,600,000
Stock Repurchased During Period, Shares (in Shares)			11,090
Silver Priced Linked Component [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Common Stock, Dividends, Per Share, Declared (in Dollars per share)			$ 0
Payments of Dividends			0
Minimum [Member]
Note 8 - Shareholders' Equity (Details) [Line Items]
Average Realized Silver Price			$ 30