Note 8 - Leases - Lease Assets and Liabilities (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 7,422,000
Finance Lease, Right-of-Use Asset	7,000
Total right of use assets	7,429,000
Operating lease obligations - current portion	975,000
Operating lease obligations - less current portion	6,589,000
Total operating lease obligations	7,564,000
Operating Lease, Right-of-Use Assets [Member]
Operating Lease, Right-of-Use Asset	7,422,000
Property and Equipment, Net of Accumulated Depreciation [Member]
Finance Lease, Right-of-Use Asset	$ 7,000