Note 15 - Share-Based and Other Compensation Plans (RSUs - Equity Settled) (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares	Dec. 31, 2014 $ / shares shares	Dec. 31, 2013 shares	Dec. 31, 2012 shares
Timed-Vested RSUs [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Restricted Stock Units (RSUs) [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee	612,881
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, Beginning of Period, Number of Shares	2,056,596
Unvested, Beginning of Period, Weighted Average Grant-Date Fair Value Per Share | $ / shares	$ 10.65
Granted, Number of Shares	612,881
Granted, Weighted Average Grant-Date Fair Value Per Share | $ / shares	$ 18.26
Vested, Number of Shares	(121,989)
Vested, Weighted Average Grant-Date Fair Value Per Share | $ / shares	$ 5.83
Forfeited, Number of Shares	(74,627)
Forfeited, Weighted Average Grant-Date Fair Value Per Share | $ / shares	$ 15.55
Unvested, End of Period, Number of Shares	2,472,861	2,056,596
Unvested, End of Period, Weighted Average Grant-Date Fair Value Per Share | $ / shares	$ 12.62	$ 10.65
2013 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee			435,970
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Performance period			3 years
Risk-free interest rate			0.40%
Volatility			81.80%
Dividend yield			0.07%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares			435,970
2013 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee			102,618
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares			102,618
2013 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Key Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee			13,260
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares			13,260
2013 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee			89,358
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares			89,358
2014 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee		702,180
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Performance period		3 years
Risk-free interest rate		1.00%
Volatility		71.90%
Dividend yield		0.06%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares		702,180
2014 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee		170,176
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares		170,176
2014 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Key Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee		85,133
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares		85,133
2014 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee		85,043
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares		85,043
2015 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee	499,740
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Performance period	3 years
Risk-free interest rate	1.00%
Volatility	40.60%
Dividend yield	0.05%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares	499,740
2015 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee	113,141
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares	113,141
2015 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Key Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee	56,970
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares	56,970
2015 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee	56,171
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares	56,171
2014 and 2013 Award Years [Member] | Performance Based RSUs [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Payout Percentage of Target Award	200.00%
Share Based Compensation, Maximum Multiplier for Target Payout	6
Vesting period (in years)	3 years
Equity Compensation Plan, 2008 [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years	3 years	3 years
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Payout Percentage of Target Award		200.00%
Share Based Compensation, Maximum Multiplier for Target Payout		6
Vesting period (in years)		3 years
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Payout Percentage of Target Award When Absolute TSR is Negative		50.00%
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee		0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares		0	0
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee	0	1,470
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares	0	1,470
Equity Compensation Plan, 2008 [Member] | 2014 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares	0
Equity Compensation Plan, 2008 [Member] | 2012 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee				2,211,640
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares				2,211,640
Equity Compensation Plan, 2008 [Member] | 2012 Award Year [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants by Compensation Committee			7,670
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Number of Shares			7,670