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						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 5,073			$ 3,687			$ 10,709	$ 7,710
Research and product development expenses	404			363			1,196	1,127
Selling, general and administrative expenses	2,893			990			7,761	2,632
Segment profit/(loss) from operations before income taxes	(610)			1,510			(2,449)	1,972
Segment profit / (loss)	(610)	$ (1,174)	$ (666)	1,507	$ 602	$ (137)	(2,452)	1,972
Total assets	46,608						46,608		$ 8,647
Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	2,018			176			4,670	226
Data Hosting Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,106			0			1,106	0
Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,949			3,511			4,933	7,484
Cryptocurrencymkty Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,743			248			1,106
Research and product development expenses
Selling, general and administrative expenses	1,030			218			1,887	398
Segment profit/(loss) from operations before income taxes	(466)			(3)			304	(147)
Segment profit / (loss)	(466)			(3)			304	(147)
Total assets	7,039			1,383			7,039	1,383
Capital expenditures	16,286			32			17,812	366
Depreciation and amortization	156			26			380	35
Revenues							2,616	248
Cryptocurrencymkty Segment [Member] | Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	2,018			176			4,670	226
Cryptocurrencymkty Segment [Member] | Data Hosting Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,106
Cryptocurrencymkty Segment [Member] | Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues
Test And Measurement Instrumentation Segment [Member]
Segment Reporting Information [Line Items]
Revenues	661			631
Research and product development expenses	404			363			1,196	1,127
Selling, general and administrative expenses	577			411			1,642	1,264
Segment profit/(loss) from operations before income taxes	678			1,691			5	2,650
Segment profit / (loss)	678			1,691			5	2,650
Total assets	2,697			3,016			2,697	3,016
Capital expenditures	20			2			37	16
Depreciation and amortization	19			19			53	62
Revenues							1,616	1,790
Test And Measurement Instrumentation Segment [Member] | Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues
Test And Measurement Instrumentation Segment [Member] | Data Hosting Revenue [Member]
Segment Reporting Information [Line Items]
Revenues
Test And Measurement Instrumentation Segment [Member] | Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,949			3,511			4,933	7,484
Other Segment [Member]
Segment Reporting Information [Line Items]
Revenues
Research and product development expenses
Selling, general and administrative expenses	1,286			361			4,232	970
Segment profit/(loss) from operations before income taxes	(822)			(178)			(2,758)	(531)
Segment profit / (loss)	(822)			(181)			(2,761)	(531)
Total assets	36,872			4,039			36,872	4,039
Capital expenditures	28						28
Depreciation and amortization	1						1
Revenues
Other Segment [Member] | Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues
Other Segment [Member] | Data Hosting Revenue [Member]
Segment Reporting Information [Line Items]
Revenues
Other Segment [Member] | Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	0
Condensed Consolidated Totals Segment [Member]
Segment Reporting Information [Line Items]
Revenues	2,404			879			1,106
Research and product development expenses	404			363			1,196	1,127
Selling, general and administrative expenses	2,893			990			7,761	2,632
Segment profit/(loss) from operations before income taxes	(610)			1,510			(2,449)	1,972
Segment profit / (loss)	(610)			1,507			(2,452)	1,972
Total assets	46,608			8,438			46,608	8,438
Capital expenditures	16,334			34			17,877	382
Depreciation and amortization	176			45			434	97
Revenues							4,232	2,038
Condensed Consolidated Totals Segment [Member] | Cryptocurrency Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	2,018			176			4,670	226
Condensed Consolidated Totals Segment [Member] | Data Hosting Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	1,106
Condensed Consolidated Totals Segment [Member] | Product Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	$ 1,949			$ 3,511			$ 4,933	$ 7,484