Note 6 - Leases (Details Textual) - USD ($)	3 Months Ended
	Jun. 30, 2019	Apr. 01, 2019	Mar. 31, 2019
Operating Lease, Right-of-Use Asset	$ 1,600,000	$ 1,900,000
Operating Lease, Liability, Total	1,681,000	1,900,000
Reclassification from Deferred Rent to Operating Lease, Right-of-Use Asset		$ 99,000
Operating Lease, Payments	$ 352,000
Operating Lease, Weighted Average Remaining Lease Term	1 year 150 days
Operating Lease, Weighted Average Discount Rate, Percent	4.59%