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Note 7 - Indebtedness | 9 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Debt Disclosure [Text Block] | Note 7. Indebtedness On August 12, 2019, we issued an aggregate principal amount of $172,500 of convertible senior notes (the "Notes"). The Notes mature on August 15, 2025, unless earlier repurchased or converted and bear interest at a rate of 1.375% payable semi-annually in arrears on February 15 and August 15 each year beginning on February 15, 2020. The Notes are initially convertible at a conversion rate of 3.5273 shares of the common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $283.50 per share of common stock. Noteholders may convert their Notes at their option only in the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ended on December 31, 2019 (and only during such calendar quarter), if the last reported sale price per share of our common stock exceeds 130% of the conversion price for each of at least 20 trading days during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter; (ii) during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the “measurement period”) in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of our common stock on such trading day and the conversion rate on such trading day; (iii) upon the occurrence of certain corporate events or distributions on our common stock, including certain distributions, the occurrence of a fundamental change (as defined in the indenture governing the Notes) or a transaction resulting in the Company’s common stock converting into other securities or property or assets; and (iv) at any time from, and including, April 15, 2025 until the close of business on the second scheduled trading day immediately before the maturity date. Upon conversion, we will pay or deliver, as the case may be, cash, shares of our common stock, or a combination of cash and shares of our common stock, at our election. Our current intent is to settle conversions entirely in shares of common stock. We will reevaluate this policy from time to time as conversion notices are received from holders of the Notes. The circumstances required to allow the holders to convert their Notes were not met during the three months ended December 31, 2020. As of December 31, 2020, the if-converted value of the Notes exceeded the principal balance. We accounted for the transaction by bifurcating the Notes into liability and equity components. The carrying amount of the liability component was $141,427 upon issuance as calculated using the income approach and measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The implied interest rate (a Level 3 unobservable input) assuming no conversion option was estimated using the Tsiveriotis-Fernandes model; all other assumptions used in measuring the fair value represent inputs market participants would use in pricing the liability component, including market interest rates, credit standing, and yield curves, all of which are defined as Level 2 observable inputs before allocated issuance costs and deferred taxes. The carrying amount of the equity component representing the conversion option was $31,073 and was determined by deducting the fair value of the liability component from the par value of the Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount (the "Debt Discount") is being amortized to interest expense using the effective interest method over the six-year contractual term of the Notes. Debt issuance costs related to the Notes comprised of discounts and commissions payable to the initial purchasers of $5,175 and third party offering costs of $255. We allocated the total amount incurred to the liability and equity components of the Notes based on their relative values. Issuance costs attributable to the liability component were $4,452 and are being amortized to interest expense using the effective interest method over the contractual term. Issuance costs attributable to the equity component were netted with the equity component in stockholders’ equity. The net carrying amount of the Notes were as follows:
|  | December 31, 2020 |  |  | March 31, 2020 |
Principal outstanding |  | $ | 172,500 |  |  | $ | 172,500 |
Unamortized debt discount |  |  | (24,696 | ) |  |  | (28,205 | )
Unamortized debt issuance costs |  |  | (3,502 | ) |  |  | (4,017 | )
Net carrying value |  | $ | 144,302 |  |  | $ | 140,278 |
The net carrying amount of the equity component of the Notes were as follows:
|  | December 31, 2020 |  |  | March 31, 2020 |
Amount allocated to conversion option |  | $ | 31,073 |  |  | $ | 31,073 |
Less: allocated issuance costs and deferred taxes |  |  | (8,338 | ) |  |  | (8,338 | )
Equity component, net |  | $ | 22,735 |  |  | $ | 22,735 |
We recognized interest expense on the Notes as follows:
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Coupon interest expense at 1.375% |  | $ | 593 |  |  | $ | 593 |  |  | $ | 1,779 |  |  | $ | 909 |
Amortization of debt discounts and issuance costs |  |  | 1,357 |  |  |  | 1,295 |  |  |  | 4,024 |  |  |  | 2,002 |
Total |  | $ | 1,950 |  |  | $ | 1,888 |  |  | $ | 5,803 |  |  | $ | 2,911 |
The effective interest rate of the liability component of the note is approximately 5.5%.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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