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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Consolidated Statements Of Operations    
Net sales $ 124,574,371 $ 109,811,768
Cost of goods sold 79,019,315 70,250,550
Gross profit 45,555,056 39,561,218
Selling, general and administrative expenses 37,113,000 32,214,212
Operating income 8,442,056 7,347,006
Interest:    
Interest expense (868,626) (570,080)
Interest income 119 4,868
Interest expense, net (868,507) (565,212)
Other expense (76,846) (167,397)
Total other expense, net (945,353) (732,609)
Income before income tax expense 7,496,703 6,614,397
Income tax expense 1,645,705 1,820,872
Net income $ 5,850,998 $ 4,793,525
Basic earnings per share $ 1.76 $ 1.44
Diluted earnings per share $ 1.64 $ 1.30