Note 18 - Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Quarterly Financial Information [Table Text Block]

	Year Ended December 31, 2020
	March 31,		June 30,		September 30,		December 31,
	2020		2020		2020		2020
Sales	$	25,281,574	$	18,576,588	$	21,277,797	$	19,933,941
Gross Profit		6,208,143		3,499,039		4,852,417		4,371,691
Operating Income		3,138,149		530,520		2,126,417		1,657,368
Net Income		2,075,570		228,837		1,426,090		2,108,890
Net Income per Common Share:
Basic	$	0.63	$	0.07	$	0.43	$	0.63
Diluted	$	0.63	$	0.07	$	0.43	$	0.63

	Year Ended December 31, 2019
	March 31,		June 30,		September 30,		December 31,
	2019		2019		2019		2019
Sales	$	21,836,087	$	24,514,636	$	22,244,681	$	21,103,124
Gross Profit		4,829,888		5,226,933		4,987,563		4,530,251
Operating Income		2,571,071		2,791,553		2,558,779		2,589,263
Net Income		1,745,458		1,831,479		1,694,868		1,708,058
Net Income per Common Share:
Basic	$	0.63	$	0.66	$	0.59	$	0.58
Diluted	$	0.55	$	0.57	$	0.52	$	0.51