Note 3 - Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	Mar 31, 2019			Dec 31, 2018
Raw materials	$	2,127,147		$	1,767,458
Work-in-progress		393,802			370,075
Finished goods		1,632,673			1,196,516
Reduction to LIFO cost		(1,313,446	)		(1,287,461	)
Total Inventories	$	2,840,176		$	2,046,588