Note 10 - Leases - Payments Under Non-cancelable Operating Leases and Capital Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Capital leases, 2018	$ 80
Operating leases, 2018	708
Capital leases, 2019	51
Operating leases, 2019	679
Capital leases, 2020	34
Operating leases, 2020	485
Capital leases, 2021	6
Operating leases, 2021	377
Capital leases, 2022	1
Operating leases, 2022	190
Capital leases, Total minimum lease payments	172
Less: Amount representing interest	14
Present value of minimum lease payments	158
Less: Current maturities	71	$ 82
Capital lease obligations, net of current portion	$ 87