Note 18 - Redeemable, Convertible Series A Preferred Stock (Details Textual)			12 Months Ended
	Nov. 15, 2016 USD ($) $ / shares shares	Nov. 14, 2016 Member Director $ / shares	Dec. 31, 2016 USD ($) $ / shares shares
Temporary Equity [Line Items]
Net proceeds from the issuance of preferred stock			$ 198,000,000
Cash dividends declared			$ 2,000,000
Expected number of members to nominate on conversion basis | Member		2
Series A Redeemable Preferred Stock [Member]
Temporary Equity [Line Items]
Net proceeds from the issuance of preferred stock	$ 198,000,000
Stock issuance costs	$ 2,000,000
Series A Redeemable Preferred Stock [Member] | Mandatorily Redeemable [Member]
Temporary Equity [Line Items]
Preferred stock, redemption date			Nov. 15, 2021
Series A Preferred Stock [Member]
Temporary Equity [Line Items]
Percentage of cash dividend payable on preferred stock		5.50%
Preferred stock, redemption date			Nov. 15, 2021
Preferred stock, liquidation preference | $ / shares		$ 100
Cash dividends declared			$ 2,000,000
Dividend paid date			Jan. 17, 2017
Number of additional directors to elect if dividends in arrears | Director		2
Common stock price equal or exceeds preferred stock conversion price percentage			125.00%
Preferred stock conversion description			The Company will have the right to convert Series A Preferred Stock into Common Stock at any time after the second anniversary of the initial issuance, if the closing price of the Common Stock has equaled or exceeded 125 percent of the then-effective conversion price for 45 trading days within a period of 60 consecutive trading days, with the last trading day of such 60 day period ending on the trading day immediately preceding the business day on which the Company issues a press release announcing the mandatory conversion.
Net proceeds received to derivative liability			$ 43,000,000
Total value of embedded derivative liability ($ millions)			43,000,000
Carrying value of Series A preferred stock at issuance			155,000,000
Gross proceeds from preferred stock			200,000,000
Transaction costs			$ 2,000,000
Preferred stock, redemption price per share | $ / shares			$ 100
Series A Preferred Stock [Member] | Other Noncurrent Liabilities [Member]
Temporary Equity [Line Items]
Total value of embedded derivative liability ($ millions)			$ 43,000,000
Purchase Agreement [Member] | Series A Redeemable Preferred Stock [Member]
Temporary Equity [Line Items]
Preferred stock, number of shares issued | shares	2,000,000
Percentage of cash dividend payable on preferred stock	5.50%
Preferred Stock, No Par Value | $ / shares	$ 0
Gross proceeds from issuance of shares	$ 200,000,000
Preferred stock purchase price per share | $ / shares	$ 100
Purchase agreement date			Nov. 07, 2016
Purchase Agreement [Member] | Series A Preferred Stock [Member]
Temporary Equity [Line Items]
Initial conversion rate of preferred stock to common stock | shares			5.7471
Initial conversion price of preferred stock per share of common stock | $ / shares			$ 17.40
Registration Rights Agreement [Member] | Series A Preferred Stock [Member]
Temporary Equity [Line Items]
Purchase agreement date			Nov. 15, 2016
Registration Rights Agreement [Member] | Series A Preferred Stock [Member] | Minimum [Member]
Temporary Equity [Line Items]
Aggregate market value of preferred stock	$ 75,000,000