Note 3 - Revenue 1 (Details Textual) - USD ($)	3 Months Ended			6 Months Ended	9 Months Ended
	Jun. 29, 2019	Jun. 29, 2019	Jun. 30, 2018	Mar. 30, 2019	Jun. 29, 2019	Jun. 30, 2018	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2018
Contract with Customer, Asset, Net, Current, Total							$ 0
Contract with Customer, Liability, Current	$ 337,939	$ 337,939			$ 337,939			$ 2,106,514	$ 2,106,514
Revenue from Contract with Customer, Including Assessed Tax	1,234,662	1,234,663	$ 907,177		4,275,475	$ 2,547,672
Engineering Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 952,602	$ 952,603	$ 758,670	$ 2,106,514	$ 2,819,676	$ 2,218,375
Accounts Receivable [Member]
Contract with Customer, Asset, Net, Current, Total									$ 532,493