Note 3 - Acquisitions (Details Textual) - USD ($)	May 03, 2021	Oct. 01, 2020	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Goodwill, Ending Balance				$ 195,664,000	$ 58,449,000
SciSafe Holdings, Inc [Member]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage		100.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)		611,683
Business Acquisition, Share Price (in dollars per share)		$ 29.29
Payments to Acquire Businesses, Gross		$ 15,000,000
Business Acquisition, Amount Held in Escrow		1,500,000
Business Combination, Contingent Consideration, Liability, Total		3,700,000		$ 8,200,000	$ 6,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets		2,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities		3,297,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		12,100,000
Goodwill, Ending Balance		24,943,000
Payments to Acquire Notes Receivable			$ 500,000
Business Combination, Indemnification Assets, Amount as of Acquisition Date		$ 130,000
SciSafe Holdings, Inc [Member] | Maximum [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)		626,000
GCI Acquisition [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	6,636,470
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets	$ 740,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	23,526,000
Goodwill, Ending Balance	$ 137,215,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares, Before Adjustments (in shares)	6,646,870
Business Combination, Stock Reduced During Period, Satisfy Note Receivable (in shares)	10,400
Business Acquisition, Percentage of Equity Issuable Shares Held in Escrow Accounts for Post Closing Claims	9.00%
Business Combination, Escrow Shares, Period (Month)	24 months
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	$ 120,480,000
GCI Acquisition [Member] | One GCI Stockholder [Member]
Business Combination, Stock Reduced During Period, Satisfy Note Receivable (in shares)	10,400
Financing Receivable, after Allowance for Credit Loss, Total	$ 374,000