Note 6 - Advances on Contracts

6 Months Ended

Jun. 30, 2018

Notes to Financial Statements

Advances to Contract Manufacturer [Text Block]

NOTE 

6

 — ADVANCES ON CONTRACTS

The advances on contracts represent funding of future STA inventory purchases and Epidural replacements parts. The balance of the advances as of

June 30, 2018

and

December 31, 2017

was

$861,782

and

$697,192

respectively. The advance is classified as current based on the estimated annual usage of the underlying inventory.