Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Liabilities, Intangible Assets	$ 5,025	$ 2,217
Operating Loss Carryforwards, Total	56,600
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	32,300
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	24,300
SciSafe Holdings, Inc [Member]
Deferred Tax Liabilities, Intangible Assets	3,300
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ (3,300)
SAVSU [Member]
Deferred Tax Liabilities, Intangible Assets		1,500
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		$ (1,500)