Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

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 (year)	4	-	5

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

	Years Ended December 31,
	2014		2013
Net income (numerator)	$	2,742,000	$	2,079,000
Shares (denominator):
Basic weighted average common shares outstanding		18,414,775		19,203,406
Add: Dilutive effect of common stock options		309,410		24,461
Diluted weighted average common shares outstanding		18,724,185		19,227,867
Earnings per common share:
Basic	$	0.15	$	0.11
Diluted	$	0.15	$	0.11

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 - 2014	$	2,840,000	$	2,840,000	$	-	$	-
Marketable securities - 2013		1,256,000		1,256,000		-		-
Investment in common stock warrants - 2013		350,000		-		350,000		-