Note 6 - Leases and deferred gain on disposal of building assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Text Block [Abstract]
Operating Leases, Rent Expense	$ 151	$ 148
Base Rent After Lease Extension	$ 549
Gain from Building disposal and Lease extinguishment, to be recognized			$ 620
Gain from extinguishment of deferred rent credit, to be recognized			$ 1,526