Income Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of Income Taxes [Line Items]
Income tax provision at federal statutory rate	$ 1,229	$ 2,453
Add (deduct) effect of:
State income taxes, net of federal tax	505	970
Refundable AMT credit	0	(1,801)
Effect of tax rate change as a result of 2017 Tax Cuts and Jobs Act	0	16,869
Expiration of federal research and development credits	356	0
Expiration of capital loss carryforwards	248	0
Change in valuation allowance	(2,332)	(14,549)
Recognition of windfall NOLs	0	(2,379)
Income tax provision	$ 6	$ 1,563