Note 8 - Leases - Leases (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Right of Use Asset	$ 42,557,000	$ 42,557,000	$ 0
Operating lease liability	50,898,000	50,898,000	$ 0
Operating lease cost	1,893,000	3,785,000
Short-term lease cost	34,000	68,000
Variable lease cost	244,000	423,000
Total lease cost	2,171,000	4,276,000
Operating cash flows from operating leases	2,025,000	4,050,000
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 21,000	$ 42,000
Weighted-average remaining lease term-operating leases (in years) (Year)	8 years	8 years
Weighted average discount rate-operating leases	3.80%	3.80%