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Note 3 - Fair Value Measurements
 12 Months Ended
Mar. 31, 2020
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 debt. Due to their short-term nature, the carrying values for cash and cash equivalents, trade accounts receivable and trade accounts payable approximate fair value.  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 
March 31, 2020 
and 
March 31, 2019,
cash and cash equivalents on our Consolidated Balance Sheets included
$66,735
 and
$0,
respectively, in a money market account.  Historically, we have had debt balances for our term loan and revolver; however, the balances associated with those instruments were paid off during the year ended
March 31, 2020.
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.
 
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.
 
During the year ended
March 
31,
2020,
we issued
$172,500
aggregate principal amount of
1.375%
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:
 
   
March 31, 2020
    
March 31, 2019
  
   
Carrying Value
    
Fair Value (Level 2)
    
Carrying Value
    
Fair Value
  
Notes
   $
140,278
     $
173,363
     $
--
     $
--
  
 
The Notes are discussed in more detail in Note
10.
 "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. Preliminary fair values assigned to the assets and liabilities acquired in the GPT Acquisition were measured using Level
3
inputs, as discussed further in Note
4.
"Significant Transactions." There were
no
transfers between the levels of the fair value hierarchy during the year ended
March 31, 2020 
and year ended
March 31, 2019 
respectively.