Summarized financial information concerning the Company’s reportable segments is shown in the following table. The “Other” column includes corporate related items and items such as income taxes or unusual items, which are not allocated to reportable segme (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 3,304		$ 2,440		$ 5,636	$ 4,023
Research and development expenses	406		362		792	764
Selling, general and administrative expenses	3,030		847		4,867	1,642
Segment profit/(loss) from operations before income taxes	(1,171)		602		(1,837)	462
Segment profit / (loss)	(1,174)	$ (666)	602	$ (137)	(1,840)	465
Total assets	25,559				25,559		$ 8,647
Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,647		2,390		2,984	3,973
Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,657		50		2,652	50
Test And Measurement Instrumentation Segment [Member]
Segment Reporting Information [Line Items]
Research and development expenses	406		362		792	764
Selling, general and administrative expenses	526		437		1,066	853
Segment profit/(loss) from operations before income taxes	(270)		831		(672)	959
Segment profit / (loss)	(270)		831		(672)	959
Total assets	2,636		3,687		2,636	3,687
Capital expenditures	13		5		18	13
Depreciation and amortization	17		21		34	44
Test And Measurement Instrumentation Segment [Member] | Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,647		2,390		2,984	3,973
Test And Measurement Instrumentation Segment [Member] | Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues
Cryptocurrencymkty Segment [Member]
Segment Reporting Information [Line Items]
Research and development expenses
Selling, general and administrative expenses	292		109		855	180
Segment profit/(loss) from operations before income taxes	710		(73)		771	(144)
Segment profit / (loss)	710		(73)		771	(144)
Total assets	3,883		1,090		3,883	1,090
Capital expenditures	1,229		335		1,525	335
Depreciation and amortization	149		9		224	9
Cryptocurrencymkty Segment [Member] | Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues
Cryptocurrencymkty Segment [Member] | Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,657		50		2,652	50
Other [Member]
Segment Reporting Information [Line Items]
Research and development expenses
Selling, general and administrative expenses	2,212		301		2,946	609
Segment profit/(loss) from operations before income taxes	(1,611)		(156)		(1,936)	(353)
Segment profit / (loss)	(1,614)		(156)		(1,939)	(350)
Total assets	19,040		2,480		19,040	2,480
Capital expenditures
Depreciation and amortization
Other [Member] | Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues
Other [Member] | Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues
Condensed Consolidated Totals Segment [Member]
Segment Reporting Information [Line Items]
Research and development expenses	406		362		792	764
Selling, general and administrative expenses	3,030		847		4,867	1,642
Segment profit/(loss) from operations before income taxes	(1,171)		602		(1,837)	462
Segment profit / (loss)	(1,174)		602		(1,840)	465
Total assets	25,559		7,257		25,559	7,257
Capital expenditures	1,242		340		1,543	348
Depreciation and amortization	166		30		258	53
Condensed Consolidated Totals Segment [Member] | Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,647		2,390		2,984	3,973
Condensed Consolidated Totals Segment [Member] | Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	$ 1,657		$ 50		$ 2,652	$ 50