Contract Asset	12 Months Ended
Sep. 30, 2020
Contract Asset
Contract Asset	5. Contract Asset Contract asset principally represent sales recorded under the over time method of accounting that have not been billed to customers in accordance with applicable contract terms. Contract asset was $0 and $80,182 at September 30, 2020 and 2019, respectively. The over time method of accounting for EDC revenue, requires estimates of profit margins for contracts be reviewed by the Company on a quarterly basis. If the initial estimates of revenues and costs under a contract are accurate, the over time method results in the profit margin being recorded evenly as revenue is recognized under the contract. Changes in these underlying estimates because of revisions in revenue and cost estimates or the exercise of contract options may result in profit margins being recognized unevenly over a contract because such changes are accounted for on a cumulative basis in the period in which the estimates are revised. Significant changes in estimates related to accounting for long-term contracts may have a material effect on the Company’s results of operations in the period in which the revised estimates are made. Net cumulative catch-up adjustments resulting from changes in estimates decreased operating income by $0, $16,000 and $0 during the fiscal years ended September 30, 2020, 2019 and 2018, respectively.

5. Contract Asset

Contract asset principally represent sales recorded under the over time method of accounting that have not been billed to customers in accordance with applicable contract terms. Contract asset was $0 and $80,182 at September 30, 2020 and 2019, respectively.

The over time method of accounting for EDC revenue, requires estimates of profit margins for contracts be reviewed by the Company on a quarterly basis. If the initial estimates of revenues and costs under a contract are accurate, the over time method results in the profit margin being recorded evenly as revenue is recognized under the contract. Changes in these underlying estimates because of revisions in revenue and cost estimates or the exercise of contract options may result in profit margins being recognized unevenly over a contract because such changes are accounted for on a cumulative basis in the period in which the estimates are revised. Significant changes in estimates related to accounting for long-term contracts may have a material effect on the Company’s results of operations in the period in which the revised estimates are made. Net cumulative catch-up adjustments resulting from changes in estimates decreased operating income by $0, $16,000 and $0 during the fiscal years ended September 30, 2020, 2019 and 2018, respectively.