Note 13 - Acquisitions - Consideration (Details) - USD ($)				1 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Nov. 12, 2019	Aug. 08, 2019	Apr. 01, 2019	Nov. 30, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Stock consideration for 55.6% equity interest purchased						$ 19,932,000
Stock consideration						$ 19,932,000
Astero [Member]
Cash consideration			$ 12,521,000
Contingent consideration			1,491,000
Working capital adjustment			(71,000)
Total consideration transferred			$ 13,941,000
SAVSU [Member]
Stock consideration for 55.6% equity interest purchased		$ 19,932,000					$ 19,932,000
Stock consideration		$ 19,932,000					19,932,000
CBS Acquisition [Member]
Cash consideration	$ 11,000,000			$ 11,000,000
Contingent consideration				856,000
Total consideration transferred	15,000,000			15,856,000
Stock consideration for 55.6% equity interest purchased	4,000,000			4,000			4,000,000
Stock consideration	$ 4,000,000			$ 4,000			$ 4,000,000