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Note 6 - Business Acquisitions (Details Textual) - USD ($) |  |  |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2017 | Oct. 31, 2017 | Jul. 11, 2017 | Jun. 16, 2017 | Jun. 08, 2017 | Jan. 31, 2017 | Jan. 09, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  |  |  | $ 0 | $ 9,940,794
Repayments of Short-term Debt Related to Acquisition |  |  |  |  |  |  |  | $ 360,000 |
Minimum [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  | 2 years |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  | 2 years |
Maximum [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  | 15 years |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  | 50 years |
Clear Channel Outdoor Inc. [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  | $ 2,983,444 |  |
Other Restricted Assets, Noncurrent |  |  |  |  |  |  | $ 2,950,000 |  |
Hartlind Outdoor LLC [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ 2,817,000 |  |  |
Corey Companies Inc. [Member] | Southeastern US [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  | $ 2,991,314 |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  | $ 314,000 |
Amortization, Purchase Accounting Adjustments |  |  |  |  |  |  |  | (64,965) |
Corey Companies Inc. [Member] | Southeastern US [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  | (314,000) |
Vision Outdoor Media LLC [Member] | Southeastern US [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  | $ 3,199,036 |  |  |  |  |
View Media, LLC [Member] | Southeastern US [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 623,596 |  |  |  |  |  |
Series of Individually Immaterial Business Acquisitions [Member] | Southeastern US [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | 900,000 |  |  |  |  |  |
Surety Support Services, Inc [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 22,500 |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00% |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  | $ 450,000 |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  | $ 427,500 |  |  |  |  |  |
Repayments of Short-term Debt Related to Acquisition |  |  |  |  |  |  |  | $ 360,000 |
South Coast Surety Insurance Services, LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 70.00% |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  | $ 2,908,581 |  |  |  |  |  |  |
Remaining Ownership Interest Percentage |  | 30.00% |  |  |  |  |  |  |
Free State Bonds Inc. [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 223,500 |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Total | $ 293,000 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | $ 69,500 |  |  |  |  |  |  |  |

X
- Definition Amount of increase (decrease) in amortization from adjustments after acquisition date under purchase accounting. + References No definition available. + Details
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- Definition Represents the remaining ownership interest percentage that seller has the option but not the obligation to sell. + References No definition available. + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. Related to an acquisition. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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