Notes Receivable	9 Months Ended
Sep. 30, 2018
Receivables [Abstract]
Notes Receivable	NOTE 2 - Notes Receivable On May 1, 2017, the Company made a loan in the principal amount of $250,000 to Jaguar Precision Machine, LLC, a New Mexico limited liability company, pursuant to a Secured Convertible Promissory Note dated May 1, 2017 delivered by Jaguar to the Company. The loan bore interest at the rate of 7% per annum, was due and payable in full on May 1, 2018, was secured by certain assets of Jaguar, and is convertible at the Company’s option into 10% of the outstanding shares of the common stock of Jaguar unless Jaguar exercises its right under specified circumstances to repay all principal and accrued interest on the loan. The purpose of the loan was to provide working capital to Jaguar to, among other things, start up a metallurgical laboratory and become ASM9100 certified for contracts related to AM of high-precision aerospace and defense components, in furtherance of our strategic alliance. Sigma received from Jaguar priority for use of certain machines and services of Jaguar. On April 27, 2018, the promissory note was amended whereby the due date of the note was extended to June 1, 2018 in exchange for a cash payment of $5,000 received on May 1, 2018, 50% of which will be retained as payment for the 30-day extension. On June 6, 2018 the promissory note was amended whereby the due date was extended to August 1, 2018 in exchange for cash payments of $10,000 by each of June 7, 2018 and July 1, 2018, $8,000 of which is to be retained as payment for the 60-day extension. The first of the $10,000 payments was received by the Company on June 6, 2018. On June 15, 2018, the Company received a $150,000 payment from Jaguar, $17,803 of which was applied to accumulated interest through that date and $132,197, the balance, of which, was applied to the principal balance of the note. No payments have been received since that date. The holder of the promissory note has committed to paying the remaining principal balance along with accumulated interest on or before December 31, 2018. The September 30, 2018 principal balance of the note was $117,803 and the accumulated interest balance due was $2,346. On March 27, 2017, the Company made a loan in the principal amount of $500,000 bearing interest at the rate of 7% per annum to Morf3D, Inc., an Illinois corporation, pursuant to a Secured Convertible Promissory Note dated March 27, 2017 delivered by Morf3D to the Company. The $500,000 loan principal and $35,000 of accumulated interest was paid in full on March 27, 2018.

Notes Receivable

9 Months Ended

Sep. 30, 2018

NOTE 2 - Notes Receivable

On May 1, 2017, the Company made a loan in the principal amount of $250,000 to Jaguar Precision Machine, LLC, a New Mexico limited liability company, pursuant to a Secured Convertible Promissory Note dated May 1, 2017 delivered by Jaguar to the Company. The loan bore interest at the rate of 7% per annum, was due and payable in full on May 1, 2018, was secured by certain assets of Jaguar, and is convertible at the Company’s option into 10% of the outstanding shares of the common stock of Jaguar unless Jaguar exercises its right under specified circumstances to repay all principal and accrued interest on the loan. The purpose of the loan was to provide working capital to Jaguar to, among other things, start up a metallurgical laboratory and become ASM9100 certified for contracts related to AM of high-precision aerospace and defense components, in furtherance of our strategic alliance. Sigma received from Jaguar priority for use of certain machines and services of Jaguar. On April 27, 2018, the promissory note was amended whereby the due date of the note was extended to June 1, 2018 in exchange for a cash payment of $5,000 received on May 1, 2018, 50% of which will be retained as payment for the 30-day extension. On June 6, 2018 the promissory note was amended whereby the due date was extended to August 1, 2018 in exchange for cash payments of $10,000 by each of June 7, 2018 and July 1, 2018, $8,000 of which is to be retained as payment for the 60-day extension. The first of the $10,000 payments was received by the Company on June 6, 2018. On June 15, 2018, the Company received a $150,000 payment from Jaguar, $17,803 of which was applied to accumulated interest through that date and $132,197, the balance, of which, was applied to the principal balance of the note. No payments have been received since that date. The holder of the promissory note has committed to paying the remaining principal balance along with accumulated interest on or before December 31, 2018. The September 30, 2018 principal balance of the note was $117,803 and the accumulated interest balance due was $2,346.

On March 27, 2017, the Company made a loan in the principal amount of $500,000 bearing interest at the rate of 7% per annum to Morf3D, Inc., an Illinois corporation, pursuant to a Secured Convertible Promissory Note dated March 27, 2017 delivered by Morf3D to the Company. The $500,000 loan principal and $35,000 of accumulated interest was paid in full on March 27, 2018.