Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	Dec 31, 2019			Dec 31, 2018
Raw materials	$	1,667,154		$	1,767,458
Work-in-progress		419,906			370,075
Finished goods		1,449,854			1,196,516
Reduction to LIFO cost		(1,356,378	)		(1,287,461	)
Total Inventories	$	2,180,536		$	2,046,588

Property, Plant and Equipment [Table Text Block]

	Years
Buildings	15-40
Machinery and equipment	5-10
Office equipment	3-10
Vehicles	3

Schedule of Weighted Average Number of Shares [Table Text Block]

	Dec 31, 2019		Dec 31, 2018
Weighted average common shares outstanding		1,980,253		1,983,553
Dilutive effect of stock options		—		—
Weighted average common and common equivalent shares outstanding		1,980,253		1,983,553