Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 3,431,200	$ 1,013,500
Adjustment to reconcile net income to net cash provided (used) by operating activities:
Depreciation and amortization	591,400	264,900
Stock-based compensation	183,500	189,500
Deferred income taxes	829,200	649,600
Change in operating assets and liabilities:
Accounts receivable	304,200	(2,774,700)
Inventories	(3,842,600)	(305,500)
Prepaid expenses and other assets	(75,300)	(54,200)
Income taxes payable (receivable)	204,300	(13,400)
Accounts payable and accrued expenses	333,600	906,300
Total adjustments to net income	(1,471,700)	(1,137,500)
Net cash provided (used) by operating activities	1,959,500	(124,000)
Cash flows from investing activities:
Cash paid for Acquisition		(9,000,000)
Purchase of property and equipment	(352,600)	(223,600)
Net cash used by investing activities:	(352,600)	(9,223,600)
Cash flows from financing activities:
Borrowing under line-of-credit		3,694,100
Repayments under line-of-credit	(750,000)	(1,794,100)
Proceeds from issuance of long-term debt		2,400,000
Repayments of long-term debt	(600,000)	(200,000)
Debt issuance costs		(75,200)
Proceeds from exercise of stock options	34,800	30,500
Net cash (used) provided by financing activities:	(1,315,200)	4,055,300
Net increase (decrease) in cash and cash equivalents	291,700	(5,292,300)
Cash and cash equivalents, beginning of period	2,097,300	7,165,100
Cash and cash equivalents, end of period	2,389,000	1,872,800
Supplemental disclosures:
Cash paid during the period for interest	101,500	$ 77,500
Cash paid during the period for income taxes	$ 865,700