Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Property, Plant, and Equipment, Useful Lives [Table Text Block]

Buildings (in years)			25
Machinery and equipment (in years)	5	-	15
Office furniture and equipment (in years)	2	-	7
Leasehold improvements (in years)	4	-	5
Software (in years)			5

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Years Ended December 31,
	2020		2019
Net income (numerator)	$	27,086,000	$	3,000,000
Shares (denominator):
Basic weighted average common shares outstanding		13,449,987		13,142,872
Add: Dilutive effect of common stock options		522,158		25,853
Diluted weighted average common shares outstanding		13,972,145		13,168,725
Earnings per common share:
Basic	$	2.01	$	0.23
Diluted	$	1.94	$	0.23

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	Fair Value Measurements as of December 31,
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities 2020	$	-	$	-	$	-	$	-
Marketable securities 2019		335,000		335,000		-		-