Annual report pursuant to Section 13 and 15(d)

FINANCING ARRANGEMENTS - Senior secured notes (Details)

v3.20.4
FINANCING ARRANGEMENTS - Senior secured notes (Details) - Senior secured notes - USD ($)
12 Months Ended
Sep. 20, 2012
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing arrangements        
Debt instrument, face $ 35,000,000      
Interest rate 8.00%      
Interest expense   $ 77,000 $ 516,000 $ 938,000
Redemption period - 5 days notice        
Financing arrangements        
Redemption price percentage 100.00%