Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018		2017
Net income (numerator)	$	3,625,000	$	2,633,000
Shares (denominator):
Basic weighted average common shares outstanding		13,909,688		14,825,600
Add: Dilutive effect of common stock options		53,131		167,409
Diluted weighted average common shares outstanding		13,962,819		14,993,009
Earnings per common share:
Basic	$	0.26	$	0.18
Diluted	$	0.26	$	0.18

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 2018	$	258,000	$	258,000	$	-	$	-
Marketable securities 2017		343,000		343,000		-		-