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Note O - Long-term Debt (Details Textual) - USD ($)
May 01, 2018
Nov. 01, 2017
Mar. 10, 2015
Jun. 24, 2018
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%