Significant Market Segments And Customers (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant market segments
Accounts receivable	$ 6,355,566	$ 6,393,228
Assets	$ 58,779,640	$ 83,153,638
International sales
Significant market segments
Direct sales percentage of sales	12.00%	12.00%	13.00%
DaVita Healthcare Partners, Inc.
Significant market segments
Direct sales percentage of sales	50.00%	52.00%	48.00%
Accounts receivable	$ 2,411,367	$ 2,224,046
Baxter Healthcare Organization
Significant market segments
Accounts receivable	$ 1,863,412	$ 2,430,159
Baxter Healthcare Organization \| Customer concentration
Significant market segments
Direct sales percentage of sales	27.00%	24.00%	28.00%

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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