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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Operating Activities:    
Net income $ 5,850,998 $ 4,793,525
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation 1,490,805 1,318,357
Amortization 930,941 734,496
Stock compensation expense 440,536 513,986
Deferred income taxes 100,529 (201,553)
Changes in operating assets and liabilities    
Accounts receivable 499,940 (16,948)
Inventories (1,483,785) (2,599,728)
Prepaid expenses and other current assets 314,824 (123,267)
Accounts payable 610,498 (1,065,428)
Other accrued liabilities 101,927 (2,273,701)
Total adjustments 3,006,214 (3,713,786)
Net cash provided by operating activities 8,857,211 1,079,738
Investing Activities:    
Purchase of plant, property and equipment (1,809,823) (1,756,732)
Purchase of patents and trademarks (29,371) (161,877)
Proceeds from sales of plant, property and equipment   4,980
Acquisition of DMT (6,970,910)  
Net cash used by investing activities (8,810,104) (1,913,629)
Financing Activities:    
Net borrowings of long-term debt 7,023,205 1,765,811
Distributions to shareholders (1,332,757) (1,198,848)
Cash settlement of stock options (2,274,374)  
Excess tax benefit from the exercise of stock options 567,309  
Purchase of treasury stock (907,094) (679,696)
Issuance of common stock 394,538 1,248,782
Net cash provided by financing activities 3,470,827 1,136,049
Effect of exchange rate changes (33,056) (161,929)
Net increase in cash and cash equivalents 3,484,880 140,231
Cash and cash equivalents at beginning of year 2,425,891 2,285,660
Cash and cash equivalents at end of year 5,910,770 2,425,891
Supplemental cash flow information    
Cash paid for income taxes 1,779,879 2,412,008
Cash paid for interest expense $ 841,634 $ 563,837