Note 10 - Right-of-use Asset and Leasing Liabilities (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 31, 2019
Lessee, Finance Lease, Term of Contract (Year)	3 years
Operating Lease, Right-of-Use Asset	$ 1,223		$ 1,348	$ 1,553
Operating Lease, Liability, Total	1,461			$ 1,744
Operating Lease, Payments	$ 179	$ 88
Richardson Property [Member]
Lessee, Operating Lease, Term of Contract (Year)	4 years 244 days
The San Marcos Property [Member]
Lessee, Operating Lease, Term of Contract (Year)	270 days