(8) Income Taxes - Deferred tax assets (Details) - USD ($)	Dec. 28, 2019	Dec. 29, 2018
Deferred Tax Assets:
Net operating loss carryforwards	$ 884,508	$ 738,213
Stock compensation	543,614	524,893
Credit carryforwards	1,317,445	1,365,068
Inventory	316,943	281,192
Accrued liabilities	18,920	21,615
Depreciation	237,449	215,936
Other	2,732	2,985
Gross deferred tax assets	3,321,611	3,149,902
Valuation allowance	3,173,738	2,963,155
Net deferred tax assets	$ 147,873	$ 186,747