N.J. Stat. § 4:13-31
The directors may establish reserve funds for working capital and for contingencies and patrons' revolving funds and transfer thereto, from time to time in their discretion, such sums as they may deem expedient. The association may provide for the payment of expenses necessary in the performance of its services for members, and accumulation of the said funds, through fees, dues, assessments, charges, retains or deductions from patrons' refunds, and earnings or savings to be fixed and collected as prescribed by the board of directors.
Shares in such patrons' revolving funds may be evidenced by certificates or notices, which may be issued upon such terms and shall be redeemable and payable at such times, as shall, from time to time, be determined by the board of directors.
N.J.S. § 4:13-31