Post-effective amendment to a registration statement that is not immediately effective upon filing

RELATED-PARTY TRANSACTIONS (Details)

v3.21.1
RELATED-PARTY TRANSACTIONS (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
RELATED-PARTY TRANSACTIONS      
Total management fees paid $ 0 $ 557,000 $ 550,000