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Note 14 - Deferred Revenue
12 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Contract with Customer, Liability [Text Block]
14.
DEFERRED REVENUE
 
Deferred revenue relates primarily to consumer and customer warranties. These constitute future performance obligations and the Company defers revenue
related to these future performance obligations. The Company recognized revenue, which was included in the deferred revenue liability at the beginning of the periods, of  
$497,351
and
$480,375
in the
twelve
months ended
June 30, 2019
and
2018,
respectively, for performance obligations related to consumer and customer warranties