Note 3 - Acquisitions - Acquired Intangible Assets (Details) - USD ($)			3 Months Ended
	Nov. 11, 2019	Apr. 01, 2019	Mar. 31, 2019	Nov. 12, 2019
Astero [Member]
Intangible assets		$ 12,150,000	$ 4,120,000
Astero [Member] | Customer Relationships [Member]
Intangible assets		$ 160,000	$ 160,000
Intangible assets, estimated useful life (Year)		6 years	4 years
Astero [Member] | Trade Names [Member]
Intangible assets		$ 470,000	$ 470,000
Intangible assets, estimated useful life (Year)		9 years	9 years
Astero [Member] | Developed Technology Rights [Member]
Intangible assets		$ 2,840,000	$ 2,840,000
Astero [Member] | Developed Technology Rights [Member] | Minimum [Member]
Intangible assets, estimated useful life (Year)			5 years
Astero [Member] | Developed Technology Rights [Member] | Maximum [Member]
Intangible assets, estimated useful life (Year)			9 years
Astero [Member] | Technology-Based Intangible Assets [Member]
Intangible assets		$ 10,750,000
Astero [Member] | Technology-Based Intangible Assets [Member] | Minimum [Member]
Intangible assets, estimated useful life (Year)		7 years
Astero [Member] | Technology-Based Intangible Assets [Member] | Maximum [Member]
Intangible assets, estimated useful life (Year)		8 years
Astero [Member] | In Process Research and Development [Member]
Intangible assets		$ 650,000	$ 650,000
Intangible assets, estimated useful life (Year)			9 years
CBS Acquisition [Member]
Intangible assets	$ 6,790,000			$ 6,800,000
CBS Acquisition [Member] | Customer Relationships [Member]
Intangible assets	$ 560,000
Intangible assets, estimated useful life (Year)	6 years
CBS Acquisition [Member] | Trade Names [Member]
Intangible assets	$ 800,000
Intangible assets, estimated useful life (Year)	6 years
CBS Acquisition [Member] | Developed Technology Rights [Member]
Intangible assets	$ 5,430,000
Intangible assets, estimated useful life (Year)	9 years