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Note 3 - Acquisitions (Details Textual)
3 Months Ended 12 Months Ended 93 Months Ended 99 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
2015 Acquisitions [Member] | Selling, General and Administrative Expenses [Member]          
Business Combination, Acquisition Related Costs $ 0 $ 35,000      
2015 Acquisitions [Member] | Scenario, Adjustment [Member]          
Business Combination, Consideration Transferred 271,000   $ 271,000    
2015 Acquisitions [Member]          
Business Combination, Consideration Transferred 75,670,000   75,700,000    
Payments to Acquire Businesses, Gross     76,800,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     1,100,000    
Business Acquisition, Transaction Costs     $ 882,000    
Business Acquisition, Goodwill, Expected Tax Deductible Amount 24,600,000     $ 24,600,000 $ 24,600,000
Business Acquisition, Purchase Price Allocation, Intangible Assets Expected, Tax Deductible, Amount 30,400,000     30,400,000 30,400,000
2016 Acquisitions [Member] | Selling, General and Administrative Expenses [Member]          
Business Combination, Acquisition Related Costs 82,000 0      
2016 Acquisitions [Member]          
Business Combination, Consideration Transferred 99,638,000        
Payments to Acquire Businesses, Gross 92,000,000        
Business Acquisition, Transaction Costs 446,000     446,000 446,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability 7,600,000     $ 7,600,000 $ 7,600,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual 13,000,000        
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual 231,000        
Business Combination, Acquisition Related Costs 1,058,000 559,000      
Number of Businesses Acquired       57 57
Business Combination, Pro Forma Information, Adjustments to Interest and Other Expenses Related to Funding of Acquisition 128,000 2,300,000      
Business Combination, Pro Forma Information, Incremental Depreciation and Amoritzation 315,000 5,100,000      
Business Combination, Pro Forma Information, Adjustments to Selling, General and Administrative Expense $ 1,200,000 $ 948,000