Note 8 - Property and Equipment (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Depreciation, Total		$ 1,046	$ 992
Impairment of Intangible Assets, Finite-lived	$ 1,676	1,676
Proceeds from Sale of Property, Plant, and Equipment, Total		282
Restructuring Plan 2019 [Member] | Equipment [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total		282
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		11
Cost of Sales [Member]
Depreciation, Total		82	76
Selling, General and Administrative Expenses [Member]
Depreciation, Total		$ 964	$ 916