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Condensed Consolidated Statements of Cash Flows - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 1,087,500 $ 1,956,400
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 433,200 388,500
Stock-based compensation 120,800 112,000
Deferred income taxes (114,900) 576,700
Change in operating assets and liabilities:    
Accounts receivable (907,900) (41,800)
Inventories 1,055,800 (794,600)
Prepaid expenses and other assets (80,300) (228,400)
Income taxes (receivable) payable (569,300) 611,600
Accounts payable and accrued expenses 757,900 (799,800)
Contract liability 259,300  
Total adjustments to net income 954,600 (175,800)
Net cash provided by operating activities 2,042,100 1,780,600
Cash flows from investing activities:    
Purchase of property and equipment (40,300) (124,700)
Net cash used by investing activities (40,300) (124,700)
Cash flows from financing activities:    
Repayments under line-of-credit   (750,000)
Repayments of long-term debt (1,200,000) (400,000)
Proceeds from exercise of stock options 88,800 34,800
Net cash used by financing activities (1,111,200) (1,115,200)
Net increase in cash and cash equivalents 890,600 540,700
Cash and cash equivalents, beginning of period 4,113,800 2,097,300
Cash and cash equivalents, end of period 5,004,400 2,638,000
Supplemental disclosures:    
Cash paid during the period for interest 34,200 $ 75,100
Cash paid during the period for income taxes $ 1,043,500