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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 2,713,711 $ 2,258,997
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 878,955 929,408
Loss on disposal or abandonment of assets 4,556 515
Non-cash stock-based compensation 52,688 171,160
Deferred income taxes (96,057) (147,345)
Foreign currency translation (268,321) 627,609
Net changes in assets and liabilities:    
Accounts receivable-trade (35,043) 63,667
Inventory (709,072) (4,149,949)
Prepaid expenses 98,203 130,098
Other current assets 113,570 (256)
Accounts payable-trade (189,928) (137,841)
Accrued expenses and other liabilities (1,258,506) (1,465,374)
Income taxes payable (255,695) 508,900
Total adjustments (1,664,650) (3,469,408)
Net cash provided by (used in) operating activities 1,049,061 (1,210,411)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (421,861) (1,004,906)
Proceeds from sale of assets 7,028 100
Increase in other assets (3,910) (29,121)
Net cash used in investing activities (418,743) (1,033,927)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from notes payable and long term debt 982,938
Repurchase of common stock (treasury stock) (995,186)
Proceeds from exercise of stock options 223,404
Net cash (used in) provided by financing activities (12,248) 223,404
NET INCREASE (DECREASE) IN CASH 618,070 (2,020,934)
CASH, beginning of period 18,337,258 16,862,304
CASH, end of period 18,955,328 14,841,370
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:    
Interest paid during the period 142,824 90,024
Income tax paid during the period, net of refunds $ 1,331,272 $ 554,670