Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Property, Plant and Equipment [Table Text Block]

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

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

	Years Ended December 31,
	2016		2015
Net income (numerator)	$	3,168,000	$	1,041,000
Shares (denominator):
Basic weighted average common shares outstanding		16,835,129		18,197,109
Add: Dilutive effect of common stock options		-		41,255
Diluted weighted average common shares outstanding		16,835,129		18,238,364
Earnings per common share:
Basic	$	0.19	$	0.06
Diluted	$	0.19	$	0.06

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 - 2016	$	607,000	$	607,000	$	-	$	-
Marketable securities - 2015		656,000		656,000		-		-