Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	Dec 31, 2018			Dec 31, 2017
Raw materials	$	1,767,458		$	1,428,924
Work-in-progress		370,075			423,186
Finished goods		1,196,516			1,416,547
Reduction to LIFO cost		(1,287,461	)		(1,182,592	)
Total Inventories	$	2,046,588		$	2,086,065

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]

	2018		2017
Weighted average common shares outstanding		1,983,553		2,007,613
Dilutive effect of stock options		—		—
Weighted average common and common equivalent shares outstanding		1,983,553		2,007,613