Income taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax (benefit) at the federal statutory rate	$ (228)	$ (209)
State income tax benefit	(77)	(69)
NOL expiration	360	938
Prior year true up to return	(565)	(195)
Permanent items and other	68	81
Change in valuation allowance	(689)	(548)
Income tax expense	$ (1)	$ (2)