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Note O - Long-term Debt (Details Textual) - USD ($)
Sep. 23, 2018
May 01, 2018
Nov. 01, 2017
Mar. 25, 2018
Dividends Payable, Amount Per Share     $ 5  
Senior Notes [Member]        
Debt Instrument, Fixed Charge Coverage Ratio 2      
Debt Instrument, Priority Secured Leverage Ratio 0.4      
Debt Instrument Secured Leverage Ratio 3.75      
Debt Instrument, Event of Default, Percentage Ownership Enabling the Declaration of Due and Payable 25.00%      
Senior Notes [Member] | In The Event of Certain Equity Offerings [Member]        
Debt Instrument, Redemption Price, Percentage 106.625%      
Senior Notes [Member] | In the Event of Chang of Control Offer [Member]        
Debt Instrument, Redemption Price, Percentage 101.00%      
Senior Notes [Member] | In the Event the Company Sells Certain Assets and Fails to Use the Proceeds as Required [Member]        
Debt Instrument, Redemption Price, Percentage 100.00%      
Senior Notes [Member] | Senior Secured 2025 Notes [Member]        
Proceeds from Issuance of Long-term Debt, Total     $ 150,000,000  
Debt Instrument, Interest Rate, Stated Percentage 6.625%   6.625% 6.625%
Debt Instrument, Periodic Payment, Interest   $ 4,968,750    
Senior Notes [Member] | Senior Secured 2020 Notes [Member]        
Debt Instrument, Interest Rate, Stated Percentage     10.00%  
Senior Notes [Member] | Option to Redeem Notes at Redemption Price Equal to the Percentage of Principal Amount plus the Applicable Premium [Member]        
Debt Instrument, Redemption Price, Percentage 100.00%      
Senior Notes [Member] | Option to Redeem Notes at Redemption Price Equal to the Percentage of Principal Amount plus the Applicable Premium [Member] | Applicable Premium if Percentage of Principal Amount is Greater than Treasury Rate Basis Spread [Member]        
Debt Instrument, Applicable Premium, Percentage of Principal Amount 1.00%      
Senior Notes [Member] | Option to Redeem Notes at Redemption Price Equal to the Percentage of Principal Amount plus the Applicable Premium [Member] | Applicable Premium if Treasury Rate Basis Spread is Greater than Percentage of Principal Amount [Member] | Treasury Rate [Member]        
Debt Instrument, Applicable Premium, Treasury Rate Basis Spread 0.50%      
Senior Notes [Member] | Option to Redeem at Redemption Price Equal to Percentage of Principal Amount [Member] | In The Event of Certain Equity Offerings [Member] | Maximum [Member]        
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 35.00%