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Note K - Long-term Debt (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
Nov. 01, 2019
May 01, 2019
Nov. 01, 2017
Mar. 10, 2015
Jun. 01, 2020
Mar. 29, 2020
Dividends Payable, Amount Per Share (in dollars per share)     $ 5      
Senior Secured 2025 Notes [Member] | Subsequent Event [Member]            
Debt Instrument, Repurchased Face Amount         $ 10,000  
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      
Debt Instrument, Interest Rate, Stated Percentage     6.625%     6.625%
Debt Instrument, Periodic Payment, Interest $ 4,969 $ 4,969        
Senior Notes [Member] | Senior Secured 2020 Notes [Member]            
Debt Instrument, Interest Rate, Stated Percentage     10.00%      
Debt Instrument, Face Amount     $ 135,000      
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%