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Note 3 - Fair Value Measurements
 6 Months Ended
Sep. 30, 2019
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
Note
3.
Fair Value Measurements
 
Our financial instruments consist primarily of cash and cash equivalents, trade accounts receivable, obligations under trade accounts payable and short and long-term debt. We measure our cash equivalents at fair value, and classify them within Level
1
of the fair value hierarchy and we value them using quoted market prices in an active market. As of
September 30, 2019
 and 
March 31, 2019
, cash and cash equivalents on our Condensed Consolidated Balance Sheets included
$235,989
 and
$0,
respectively, in a money market account. Due to their short-term nature, the carrying values of trade accounts receivable and trade accounts payable approximate fair value. 
 
Historically, we have had debt balances for our term loan and revolver; however, the balances associated with those instruments were paid off during the
three
months ended
September 30, 2019. 
Debt balances as of
March 31, 2019
had a variable interest rate, so the carrying amount approximated fair value because interest rates on these instruments approximated the interest rate of debt with similar terms available to us. 
 
During the
three
months ended
September 30, 2019,
we issued
$172,500
aggregate principal amount of convertible senior notes due
August 15, 2025 (
the "Notes"). We estimate the fair value of the Notes based on the last actively traded price or market observable input before the end of the reporting period. The estimated fair value and carrying value of the Notes were as follows:
 
 
   
September 30, 2019
    
March 31, 2019
  
   
Carrying Value
    
Fair Value (Level 2)
    
Carrying Value
    
Fair Value
  
Notes
   $
137,682
     $
184,575
     $
--
     $
--
  
 
The Notes are discussed in more detail in Note
6.
 "Indebtedness." 
 
Assets recognized or disclosed at fair value on the consolidated financial statements on a nonrecurring basis include items such as property and equipment, operating lease assets, goodwill, and other intangible assets. These assets are measured at fair value if determined to be impaired. Except as stated below in "Acquisitions," we had
no
non-financial assets or liabilities that were measured using Level
3
inputs during the 
six
months ended
September 30, 2019
. There were
no
transfers between the levels of the fair value hierarchy during the 
three
and
six
months ended
September 30, 2019
 and
three
and
six
months ended
September 30, 2018
 respectively. 
 
Cash and cash equivalents and accounts receivables are the financial instruments that subject us to the highest concentration of credit risk. It is our policy to invest cash equivalents in highly liquid financial instruments with high credit ratings, and low exposure to a single issuer (except U.S. treasuries). Concentration of credit risk with respect to accounts receivable is limited to customers to which we make significant sales. We reserve an allowance for potential write-offs of accounts receivable, but we have
not
written off any significant accounts to date. To control credit risk, we perform regular credit evaluations of our customers’ financial condition.