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Note O - Long-term Debt (Details Textual) - USD ($)
Nov. 01, 2017
Mar. 10, 2015
Jun. 30, 2019
Mar. 31, 2019
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, Face Amount $ 135,000,000      
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%