Annual report pursuant to Section 13 and 15(d)

FINANCING ARRANGEMENTS - Amortization expense (Details)

v3.20.4
FINANCING ARRANGEMENTS - Amortization expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
FINANCING ARRANGEMENTS      
Amortization expense $ 740,372 $ 802,280 $ 1,019,953