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Revenue - Contract Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Deferred revenue
Advance payments from customers			$ 12,765	$ 180,425
Shipments in-transit			4,250	9,582
Extended warranty agreements			4,284,872	3,415,782
Total	$ 4,301,887	$ 3,605,789	$ 4,301,887	$ 3,605,789
Changes in contract liabilities
Contract liabilities at beginning of the year	3,605,789	3,621,256
Increases due to cash received from customers	3,337,181	2,222,217
Decreases due to recognition of revenue	(2,641,083)	(2,237,684)
Contract liabilities at end of the year	$ 4,301,887	$ 3,605,789

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of decrease in contract liabilities due to recognition of revenue.

+ References

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- Definition

Amount of increase in contract liabilities due to cash received from customers.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to shipments in-transit.

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
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