STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash, cash equivalents and restricted cash at end of year consists of:
Cash in futures brokers trading accounts	$ 14,784,105	$ 24,706,781	$ 22,788,659
Restricted cash in futures brokers trading accounts	0	409,892	0
Cash and cash equivalents	8,959,535	678,957	627,303
Restricted cash at interbank market makers	4,424,114	0	0
Total cash, cash equivalents and restricted cash at end of year	$ 28,167,754	$ 25,795,630	$ 23,415,962