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Note 1 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Oct. 01, 2019
USD ($)
Depreciation, Depletion and Amortization, Total                         $ 400,000 $ 100,000 $ 200,000  
Goodwill, Purchase Accounting Adjustments                         57,000      
Advertising Expense                         600,000 500,000 400,000  
Revenues, Total $ 6,810,097 $ 12,889,939 $ 17,559,315 $ 17,858,946 $ 6,458,360 $ 7,004,431 $ 7,674,997 $ 6,335,494 $ 5,521,002 $ 6,297,791 $ 6,952,487 $ 7,136,291        
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member]                                
Operating Lease, Liability, Total                               $ 5,400,000
Operating Lease, Right-of-Use Asset                               $ 5,400,000
Accounting Standards Update 2016-15 [Member]                                
Reclassification of Guaranteed Payments for Business Acquisitions from Investing Activities to Financing Activities                           667,000 1,000,000  
Non-US Based Customer [Member]                                
Revenues, Total                         $ 2,400,000 $ 2,900,000 $ 3,100,000  
Revenue Benchmark [Member] | Customer Concentration Risk [Member]                                
Number of Major Customers                         1      
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Major Customer in Wireless Segment [Member]                                
Concentration Risk, Percentage                         12.00%      
Customer Relationships [Member]                                
Finite-Lived Intangible Asset, Useful Life                         10 years 10 years    
Customer Relationships [Member] | Fulton and Mill City [Member]                                
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles                         $ 200,000      
Minimum [Member]                                
Finite-Lived Intangible Asset, Useful Life                         3 years      
Maximum [Member]                                
Finite-Lived Intangible Asset, Useful Life                         10 years      
Software and Software Development Costs [Member]                                
Property, Plant and Equipment, Useful Life                         3 years      
Office Equipment [Member]                                
Property, Plant and Equipment, Useful Life                         5 years      
Warehouse and Service Equipment [Member]                                
Property, Plant and Equipment, Useful Life                         7 years      
Building [Member]                                
Property, Plant and Equipment, Useful Life                         10 years