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Debt (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Summary of long-term debt
Long-term debt in the Consolidated Balance Sheets is summarized as follows:
 
 
December 31,
(Thousands)
 
2018
 
2017
Fixed rate industrial development revenue bonds payable in annual installments through 2021
 
$
3,041

 
$
3,818

Total debt outstanding
 
3,041

 
3,818

Current portion of long-term debt
 
(823
)
 
(777
)
Gross long-term debt
 
2,218

 
3,041

Unamortized deferred financing fees
 
(152
)
 
(214
)
Long-term debt
 
$
2,066

 
$
2,827

Maturities on long-term debt instruments
Maturities on long-term debt instruments as of December 31, 2018 are as follows:
(Thousands)
 
2019
$
823

2020
868

2021
1,350

2022

2023

Thereafter

Total
$
3,041