SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | Note 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation. The accompanying condensed interim financial statements have been prepared, in all material respects, in conformity with the standards of accounting measurements and reflect, in the opinion of management, all adjustments necessary to summarize fairly the financial position and results of operations for such periods in accordance with GAAP. All adjustments are of a normal recurring nature. The results of operations for the most recent interim period are not necessarily indicative of the results to be expected for the full year. Use of Estimates in the Preparation of Financial Statements. Cash and Cash Equivalents. Fair Value of Financial Instruments. Concentration of Credit Risk. We have no significant off-balance sheet concentrations of credit risk such as foreign exchange contracts, options contracts or other foreign hedging arrangements. We maintain the majority of our cash balances with one financial institution in the form of demand deposits. Accounts receivable are typically unsecured and are derived from transactions with and from entities in the healthcare industry primarily located in the United States. Accordingly, we may be exposed to credit risk generally associated with the healthcare industry. We maintain allowances for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. The net accounts receivable balance at December 31, 2020 of $1,042,743 and at March 31, 2020 of $881,194 included no more than 8% from any one customer. Inventories December 31, 2020 March 31, 2020 Raw materials $ 1,211,805 $ 1,147,983 Finished goods 372,778 516,918 Total gross inventories 1,584,583 1,664,901 Less reserve for obsolescence (63,000 ) (39,000 ) Total net inventories $ 1,521,583 $ 1,625,901 Property and Equipment Long-Lived Assets. Patents. Income Taxes. Revenue Recognition. Research and Development Expenses Stock-Based Compensation Stock-based compensation expense recognized under ASC 718 for the three and nine months ended December 31, 2020 was $8,483 and $25,014, respectively, and the three and nine months ended December 31, 2019 was $6,650 and $22,015, respectively, which consisted of stock-based compensation expense related to grants of employee stock options. Segment Reporting. Three Months Ended December 31, 2020 Nine Months Ended December 31, 2020 Product Service Total Product Service Total Net revenue $ 1,998,979 $ 163,621 $ 2,162,600 $ 5,093,118 $ 297,457 $ 5,390,575 Cost of revenue 975,581 81,421 1,057,002 2,500,310 150,197 2,650,507 Gross profit 1,023,398 82,200 1,105,598 2,592,808 147,260 2,740,068 Operating income (loss) (69,463 ) 82,200 12,737 (362,005 ) 147,260 (214,745 ) Depreciation and amortization 20,584 — 20,584 67,907 — 67,907 Capital expenditures — — — 4,144 — 4,144 Equipment and patents, net $ 387,549 $ — $ 387,549 $ 387,549 $ — $ 387,549 Recently Issued Accounting Pronouncements. |