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Revenue Recognition
 6 Months Ended
Dec. 31, 2021
Revenue Recognition [Abstract]  
Revenue Recognition 4.    REVENUE RECOGNITION The Company disaggregates its net sales by geographical location as it believes it best depicts how the nature, timing and uncertainty of net sales and cash flows are affected by economic factors. The following table summarizes net sales by geographical location:  Three Months Ended Six Months Ended December 31, December 31, 2021 2020 2021 2020United States$ 3,191,867 $ 3,652,303 $ 6,003,559 $ 7,598,576Export 1,224,019 1,277,486 2,777,394 2,539,508Net Sales$ 4,415,886 $ 4,929,789 $ 8,780,953 $ 10,138,084 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. In the six months ended December 31, 2021 and 2020, the Company recognized revenue, which was included in the deferred revenue liability at the beginning of the periods, of $335,578 and $200,424, respectively, for performance obligations related to consumer and customer warranties.  The deferred revenue liability was $593,920 as of June 30, 2020. The Company estimates that the deferred revenue performance obligations are satisfied within one year to three years and therefore uses that same time frame for recognition of the deferred revenue.