2. Summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Accounting Policies [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

	Year ended December 31,
(In thousands)	2014		2013		2012
Balance, beginning of period	$	63	$	66	$	70
Additions charged to costs and expenses		37		-		-
Deductions		-		(3)		(4)
Balance, end of period	$	100	$	63	$	66

Accounts Receivable, Additional Narrative Disclosure

	December 31,
	2014		2013
GTECH		15%		21%
Eurocoin		11%		22%
Suzo-Happ		23%		6%
CMC Daymark		11%		19%

Concentration Risk, Customer

15%

21%

Schedule of Product Warranty Liability [Table Text Block]

	Year ended December 31,
(In thousands)	2014		2013		2012
Balance, beginning of period	$	366	$	274	$	421
Warranties issued		183		492		104
Warranty settlements		(262)		(400)		(251)
Balance, end of period	$	287	$	366	$	274