Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

Property, Plant and Equipment [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

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

	Years Ended December 31,
	2015		2014
Net income (numerator)	$	1,041,000	$	2,742,000
Shares (denominator):
Basic weighted average common shares outstanding		18,197,109		18,414,775
Add: Dilutive effect of common stock options		41,255		309,410
Diluted weighted average common shares outstanding		18,238,364		18,724,185
Earnings per common share:
Basic	$	0.06	$	0.15
Diluted	$	0.06	$	0.15

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 - 2015	$	656,000	$	656,000	$	-	$	-
Marketable securities - 2014		2,840,000		2,840,000		-		-