Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

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,
	2017		2016
Net income (numerator)	$	2,633,000	$	3,168,000
Shares (denominator):
Basic weighted average common shares outstanding		14,825,600		16,835,129
Add: Dilutive effect of common stock options		167,409		-
Diluted weighted average common shares outstanding		14,993,009		16,835,129
Earnings per common share:
Basic	$	0.18	$	0.19
Diluted	$	0.18	$	0.19

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 2017	$	343,000	$	343,000	$	-	$	-
Marketable securities 2016		607,000		607,000		-		-