Note 18 - Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Quarterly Financial Information [Table Text Block]

	Year Ended December 31, 2018
	March 31,		June 30,		September 30,		December 31,
	2018		2018		2018		2018
Sales	$	11,878,700	$	13,593,192	$	19,771,137	$	21,135,277
Gross Profit	$	3,018,441	$	3,486,578		4,450,389		4,460,559
Operating Income	$	643,085	$	1,816,945		2,471,279		2,383,150
Net Income		373,752		394,625		1,497,079		1,348,163
Net Income per Common Share:
Basic	$	0.13	$	0.14	$	0.55	$	0.50
Diluted	$	0.11	$	0.13	$	0.48	$	0.43

	Fiscal Year Ended September 30, 2017
	December 31,			March 31,		June 30,		September 30,
	2016			2017		2017		2017
Sales	$	2,356,926		$	3,346,315	$	7,220,626	$	10,892,868
Gross Profit	$	583,238		$	1,377,514		3,029,146		3,034,379
Operating Income (Loss)	$	(307,346	)	$	265,896		1,308,925		1,414,462
Net Income (Loss)	$	(313,706	)	$	213,140		941,523		567,439
Net Income (Loss) per Common Share:
Basic	$	(0.11	)	$	0.07	$	0.33	$	0.20
Diluted	$	(0.11	)	$	0.07	$	0.31	$	0.18