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Note 5 - Fair Value of Financial Instruments
9 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Fair Value Disclosures [Text Block]

NOTE
5.
FAIR VALUE OF FINANCIAL INSTRUMENTS

     Our corporate bonds and money market funds are classified as available-for-sale securities and carried at estimated fair value. Unrealized holding gains and losses are included in accumulated other comprehensive income (loss) in the statement of shareholders’ equity. Corporate bonds with remaining maturities less than
one
year are classified as short-term, and those with remaining maturities greater than
one
year are classified as long-term. We consider all highly-liquid investments with maturities of
three
months or less when purchased, including money market funds, to be cash equivalents. Gains and losses on marketable security transactions are reported on the specific-identification method.
 
    The fair value of our available-for-sale securities as of
December 
31,
2019
by maturity were as follows:
 
Total
   
<1 Year
   
1–3 Years
   
3–5 Years
 
$ 72,853,414     $
21,933,123
    $
33,904,811
    $
17,015,480
 

     Total available-for-sale securities represented approximately
90%
of our total assets. Marketable securities as of
December 
31,
2019
had remaining maturities between
10
and
50
 months.
 
     Generally accepted accounting principles establish a framework for measuring fair value, provide a definition of fair value, and prescribe required disclosures about fair-value measurements. Generally accepted accounting principles define fair value as the price that would be received to sell an asset or paid to transfer a liability. Fair value is a market-based measurement that should be determined using assumptions that market participants would use in pricing an asset or liability. Generally accepted accounting principles utilize a valuation hierarchy for disclosure of fair value measurements. The categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The categories within the valuation hierarchy are described as follows:
 
     Level
1
– Financial instruments with quoted prices in active markets for identical assets or liabilities.

     Level
2
– Financial instruments with quoted prices in active markets for similar assets or liabilities. Level 
2
fair value measurements are determined using either prices for similar instruments or inputs that are either directly or indirectly observable, such as interest rates.

     Level
3
– Inputs to the fair value measurement are unobservable inputs or valuation techniques.

     Money market funds are included on the balance sheets in “Cash and cash equivalents.” Corporate bonds are included on the balance sheets in “Marketable securities, short term” and “Marketable securities, long term.”
 
     The following table shows the estimated fair value of assets that were accounted for at fair value on a recurring basis:
 
   
As of December 31, 2019
   
As of March 31, 2019
 
   
Level 1
   
Level 2
   
Total
   
Level 1
   
Level 2
   
Total
 
Money market funds
  $
9,877,760
    $
-
    $
9,877,760
    $
6,703,809
    $
-
    $
6,703,809
 
Corporate bonds
   
-
     
62,975,654
     
62,975,654
     
-
     
67,413,454
     
67,413,454
 
Total
  $
9,877,760
    $
62,975,654
    $
72,853,414
    $
6,703,809
    $
67,413,454
    $
74,117,263
 
 
     Our available-for-sale securities as of
December 
31
and
March 
31,
2019,
aggregated into classes of securities, were as follows:
 
   
As of December 31, 2019
   
As of March 31, 2019
 
   

Amortized
Cost
   
Gross
Unrealized
Holding Gains
   
Gross
Unrealized
Holding Losses
   
Estimated
Fair
Value
   

Amortized
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
   
Estimated
Fair
Value
 
Money market funds
  $
9,877,760
    $
-
    $
-
    $
9,877,760
    $
6,703,809
    $
-
    $
-
    $
6,703,809
 
Corporate bonds
   
62,083,066
     
902,126
     
(9,538
)
   
62,975,654
     
67,519,350
     
315,902
     
(421,798
)
   
67,413,454
 
Total
  $
71,960,826
    $
902,126
    $
(9,538
)
  $
72,853,414
    $
74,223,159
    $
315,902
    $
(421,798
)
  $
74,117,263
 
 
     The following table shows the gross unrealized holding losses and fair value of our available-for-sale securities with unrealized holding losses, aggregated by class of securities and length of time that individual securities had been in a continuous unrealized loss position as of
December 
31
and
March 
31,
2019.
 
   
Less Than 12 Months
   
12 Months or Greater
   
Total
 
   
Estimated
Fair
Value
   
Gross
Unrealized
Holding Losses
   
Estimated
Fair
Value
   
Gross
Unrealized
Holding Losses
   
Estimated
Fair
Value
   
Gross
Unrealized
Holding Losses
 
                                                 
As of December 31, 2019
 
Corporate bonds
  $
4,169,606
    $
(9,538
)
  $
-
    $
-
    $
4,169,606
    $
(9,538
)
Total
  $
4,169,606
    $
(9,538
)
  $
-
    $
-
    $
4,169,606
    $
(9,538
)
                                                 
As of March 31, 2019
 
Corporate bonds
  $
-
    $
-
    $
51,413,428
    $
(421,798
)
  $
51,413,428
    $
(421,798
)
Total
  $
-
    $
-
    $
51,413,428
    $
(421,798
)
  $
51,413,428
    $
(421,798
)
 
     We did
not
consider any of our available-for-sale securities to be impaired as of
December 
31,
2019.
None
of the securities were impaired at acquisition, and subsequent declines in fair value are
not
attributed to declines in credit quality. When evaluating for impairment we assess indicators that include, but are
not
limited to, earnings performance, changes in underlying credit ratings, market conditions, bona fide offers to purchase or sell, and ability to hold until maturity. Because we believe it is more likely than
not
we will recover the cost basis of our investments, we did
not
consider any of our marketable securities to be impaired as of
December 
31,
2019.