Note 5 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Operating lease expense	$ 560	$ 1,196
Short-term lease expense	38	78
Land option expense	156	476
Total land option and lease expense	754	1,750
Cash flows from operating activities		969
Adoption of Topic 842		1,562
In exchange for new operating lease liabilities during the period		446
Office Leases [Member]
Operating lease expense	232	381
Land Leases [Member]
Operating lease expense	$ 328	$ 815