Financing Agreements and Subsequent Event (Details)			6 Months Ended	12 Months Ended
	Jan. 12, 2017	Jul. 01, 2015 USD ($) item	Jun. 30, 2017	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014
Financing arrangements
Total debt				$ 6,585,298	$ 7,636,429
Discount on Devicix Notes Payable				(102,424)	(142,072)
Debt Issuance Costs				(25,896)	(44,175)
Total long-term debt				6,456,978	7,450,182
Current maturities of long-term debt				(1,565,347)	(1,495,513)
Long-term debt - net of current maturities				4,891,631	5,954,669
Future maturity requirements for long-term debt
2017				1,565,347
2018				2,716,668
2019				578,055
2020				230,067
2021				230,067
Future				1,265,094
Total debt				$ 6,585,298	$ 7,636,429
Line of credit
Financing arrangements
Variable rate basis				three-month LIBOR
Interest rate margin on variable rate basis (as a percent)				2.25%
Interest rate (as a percent)				3.25%
Weighted-average interest rate (as a percent)				3.10%	2.80%
Outstanding balance				$ 7,315,262	$ 7,691,237
Minimum fixed charge coverage ratio				1.20
Minimum fixed charge coverage ratio thereafter				1.15
Unused availability supported by entity's borrowing base				$ 5,700,000
Real estate term note
Financing arrangements
Variable rate basis				three-month LIBOR
Interest rate margin on variable rate basis (as a percent)				2.75%
Interest rate (as a percent)				3.75%
Amount of monthly principal payments				$ 19,000
Tenth Amendment To Third Amended and Restated Credit and Security Agreement | Subsequent Event.
Financing arrangements
Minimum fixed charge coverage ratio			1.05
Minimum fixed charge coverage ratio thereafter	1.10
Real estate term notes
Financing arrangements
Variable rate basis				three-month LIBOR
Total debt				$ 2,415,428	2,645,495
Future maturity requirements for long-term debt
Total debt				$ 2,415,428	2,645,495
Equipment notes maturing in May 2015
Financing arrangements
Variable rate basis				three-month LIBOR
Interest rate margin on variable rate basis (as a percent)				2.75%
Amount of monthly principal payments				$ 46,000
Total debt				2,489,624	2,633,740
Future maturity requirements for long-term debt
Total debt				2,489,624	2,633,740
Industrial revenue bond payable to the City of Blue Earth, Minnesota
Financing arrangements
Interest rate (as a percent)						0.24%
Amount of annual principal payments				80,000
Total debt				200,000	280,000
Future maturity requirements for long-term debt
Total debt				$ 200,000	280,000
Devicix Acq Note 1, subordinate debt, due July 1, 2019
Financing arrangements
Interest rate (as a percent)				4.00%
Total debt				$ 643,585	903,128
Future maturity requirements for long-term debt
Total debt				$ 643,585	903,128
Devicix Acq Note 2, subordinate debt, due July 1, 2019
Financing arrangements
Interest rate (as a percent)				4.00%
Total debt				$ 836,661	1,174,066
Future maturity requirements for long-term debt
Total debt				$ 836,661	$ 1,174,066
Devicix LLC
Financing arrangements
Number of promissory notes | item		2
Devicix LLC | Promissory note subject to offsets
Financing arrangements
Promissory note liability		$ 1,000,000
Term of promissory note		4 years
Interest rate per annum		4.00%
Principal and interest payments		$ 22,579
Devicix LLC | Promissory note not subject to offsets
Financing arrangements
Promissory note liability		$ 1,300,000
Term of promissory note		4 years
Interest rate per annum		4.00%
Principal and interest payments		$ 29,353