Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 4,779,900	$ 2,093,400
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	160,800	173,600
Stock-based compensation	162,200	66,700
Loss on disposal of assets	0	800
Deferred income taxes	(2,556,200)	0
Change in operating assets and liabilities:
Trade receivables	26,400	141,200
Inventories	(2,008,900)	521,500
Prepaid expenses and other assets	118,800	(76,800)
Income taxes payable (receivable)	9,000	(3,700)
Accounts payable and accrued expenses	725,300	(131,200)
Total adjustments to net income	(3,362,600)	692,100
Net Cash Provided by Operating Activities	1,417,300	2,785,500
Cash flows from investing activities:
Purchase of property, plant and equipment	(190,000)	(57,000)
Net Cash Used by Investing Activities	(190,000)	(57,000)
Cash flows from financing activities:
Proceeds from exercise of stock options	41,200	41,900
Net Cash Provided by Financing Activities	41,200	41,900
Net Increase in Cash and Cash Equivalents	1,268,500	2,770,400
Cash and Cash Equivalents, beginning of year	5,896,600	3,126,200
Cash and Cash Equivalents, end of year	7,165,100	5,896,600
Supplemental disclosures:
Cash paid during the period for interest	$ 29,300	$ 29,200