Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	Dec 31, 2020			Dec 31, 2019
Raw materials	$	1,323,655		$	1,667,154
Work-in-progress		428,753			419,906
Finished goods		1,065,458			1,449,854
Reduction to LIFO cost		(1,172,891	)		(1,356,378	)
Total Inventories	$	1,644,975		$	2,180,536

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, 2020		Dec 31, 2019
Weighted average common shares outstanding		1,976,354		1,980,253
Dilutive effect of stock options and restricted stock units		—		—
Weighted average common and common equivalent shares outstanding		1,976,354		1,980,253