Income Taxes (Details 2) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Operating loss carryforwards	$ 984,000	$ 1,238,000
R&D tax credit	2,233,000	1,952,000
Section 263A costs	38,000	203,000
Amortization	18,000	21,000
Unrealized loss	442,000	391,000
Asset reserves:
Bad debts	11,000	11,000
Inventory allowance	292,000	118,000
Accrued expenses:
Non-qualified stock options	127,000	175,000
Compensation	116,000	64,000
Warranty	971,000	927,000
Deferred tax assets	5,235,000	5,098,000
Less valuation allowance	(610,000)	(98,000)
Total deferred tax assets	4,625,000	5,000,000
Deferred tax liabilities:
Depreciation	(509,000)
Total deferred tax liabilities	(509,000)
Net deferred tax assets (before unrealized gain)	4,116,000	4,300,000
Deferred tax liability: unrealized gain	0	0
Net deferred tax assets	$ 4,116,000	$ 4,300,000