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Note L - Convertible Senior Notes (Details Textual) - USD ($)
Mar. 05, 2019
Dec. 31, 2019
Branch Banking and Trust Company [Member] | CapEx Loan and Term Loan [Member]    
Repayments of Long-term Debt, Total $ 37,800,000  
The 5% Convertible Senior Notes Due 2024 [Member]    
Debt Instrument, Face Amount $ 80,500,000 $ 80,500,000
Debt Instrument, Interest Rate, Stated Percentage 5.00%  
Proceeds from Convertible Debt $ 76,400,000  
Debt Conversion, Converted Instrument, Shares Issued 56.9801  
Debt Conversion, Converted Instrument, Amount $ 1,000  
Debt Instrument, Convertible, Conversion Price $ 17.55  
Debt Instrument, Convertible, Conversion Price Premium, Percentage 30.00%  
Share Price $ 13.50  
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 130.00%  
Debt Instrument, Convertible, Threshold Trading Days 20  
Debt Instrument, Convertible, Threshold Consecutive Trading Days 30  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00%  
Debt Issuance Costs, Gross $ 4,100,000