Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

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,
	2019		2018
Net income (numerator)	$	3,000,000	$	3,625,000
Shares (denominator):
Basic weighted average common shares outstanding		13,142,872		13,909,688
Add: Dilutive effect of common stock options		25,853		53,131
Diluted weighted average common shares outstanding		13,168,725		13,962,819
Earnings per common share:
Basic	$	0.23	$	0.26
Diluted	$	0.23	$	0.26

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 2019	$	335,000	$	335,000	$	-	$	-
Marketable securities 2018		258,000		258,000		-		-