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Note 4 - Acquisition (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 15, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Expense Related to Step Up Value of Acquired Inventory   $ 900   $ 3,500  
Honeywell International, Inc. [Member]          
Business Combination, Consideration Transferred, Total $ 212,000        
Payments to Acquire Businesses, Gross 207,000        
Business Combination, Consideration Transferred, Liabilities Incurred $ 5,400        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) 25,000        
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   37,200   94,400  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   3,800   3,100  
Business Combination, Acquisition Related Costs   $ 2,800 $ 0 $ 10,300 $ 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables, Allowance for Doubtful Accounts $ 200        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory $ 3,500