Note 8 - Shareholders' Equity (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended		14 Months Ended				0 Months Ended	1 Months Ended	0 Months Ended
	Aug. 06, 2013	Jun. 21, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	May 07, 2013	Jun. 30, 2013 Vesting in 2014 [Member]	Jun. 30, 2013 Vesting in 2015 and 2016 [Member]	May 08, 2012 Common Stock [Member]	Jun. 21, 2013 Vesting in 2014 [Member]	Aug. 06, 2013 Minimum [Member]
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)		954,438										633,960
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized									$ 2,800,000	$ 2,900,000
Stock Issued During Period, Shares, New Issues (in Shares)			122,250	77,976
Allocated Share-based Compensation Expense			1,900,000	1,500,000
Stock Repurchased During Period, Shares (in Shares)					83,433		400,300
Stock Repurchased During Period, Value					100,000
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)					$ 1.55
Common Stock, Dividends, Per Share, Declared (in Dollars per share)	$ 0.0025		$ 0.0025	$ 0.0225	$ 0.0050	$ 0.0350
Dividends, Common Stock	900,000
Average Realized Silver Price	16.27												30
Stock Repurchase Program, Authorized Amount											20,000,000
Accelerated Share Repurchases, Final Price Paid Per Share (in Dollars per share)							$ 5.56
Stock Repurchase Program, Remaining Authorized Repurchase Amount							$ 19,600,000
Sale of Stock, Price Per Share (in Dollars per share)								$ 2.95