Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 5,004,400	$ 4,113,800
Accounts receivable, net	4,012,100	3,104,200
Inventories, net	7,730,900	8,786,700
Income taxes receivable	203,400
Prepaid expenses	365,400	285,100
Total current assets	17,316,200	16,289,800
Property and equipment, net	863,900	908,800
Deferred tax asset	499,100	384,200
Goodwill	1,520,600	1,520,600
Intangible assets, net	5,838,000	6,148,400
Other assets	49,100	49,100
Total assets	26,086,900	25,300,900
Current liabilities:
Accounts payable	2,537,300	1,655,900
Accrued expenses	811,900	935,400
Income taxes payable		365,900
Contract liability	259,300
Current maturities of long-term debt		800,000
Total current liabilities	3,608,500	3,757,200
Long-term debt, net of current maturities and debt issuance costs		362,400
Total liabilities	3,608,500	4,119,600
Shareholders’ equity:
Preferred stock, no par value, authorized 20,000,000 shares; no shares issued and outstanding
Common stock; $0.10 par value, authorized 50,000,000 shares; issued and outstanding 12,023,965 shares (2018) and 11,885,839 shares (2017)	1,202,400	1,188,600
Capital in excess of par	6,637,100	6,441,300
Retained earnings	14,638,900	13,551,400
Total shareholders’ equity	22,478,400	21,181,300
Total liabilities and shareholders’ equity	$ 26,086,900	$ 25,300,900