Income Taxes (Deferred Income Taxes) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred income taxes:
Net operating loss carryforwards	$ 3,541,500	$ 3,144,600
Federal and state tax credit carryforward	476,100	525,000
Accruals and reserves	150,800	104,400
Stock based compensation	106,400	68,300
Patents and intangibles	5,000	12,000
Other long-term	5,400	45,300
Total long-term deferred tax assets	4,285,200	3,899,600
Deferred tax valuation allowance	(3,877,700)	(3,374,800)
Deferred tax assets, net of allowance	407,500	524,800
Property, plant and equipment	(379,900)	(478,200)
Prepaid expenses	(24,500)	(43,500)
Total deferred tax liabilities	(404,400)	(521,700)
Net deferred tax assets	$ 3,100	$ 3,100