Note 7 - Stock-based Compensation
 6 Months Ended
Sep. 30, 2017
Notes to Financial Statements  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
NOTE
7.
STOCK-BASED COMPENSATION

   Stock-based compensation expense was
$40,920
for the
second
quarter and
first
six
months of fiscal
2018,
and
$22,000
for the
second
quarter and
first
six
months of fiscal
2017.
Stock-based compensation expenses for the quarters and
six
months ended
September 
30,
2017
and
2016
were due to the automatic issuance to our non-employee directors of options to purchase
1,000
shares of stock on their reelection to our Board. We calculate the share-based compensation expense using the Black-Scholes standard option-pricing model. The increase in stock-based compensation expense for fiscal
2018
compared to fiscal
2017
was due to an increase in the model valuation for the same number of options to purchase shares.