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Note 6 - Business Acquisitions - Separately Recognized Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Amortization of intangible assets acquired for the period		$ 260,014		$ 516,172
Revenues since the acquisition date included in the consolidated statement of operations for the period		665,990		1,183,162
Earnings since the acquisition date included in the consolidated statement of operations for the period		(29,743)		(69,812)
Costs of acquisition included in professional fees in the consolidated statement of operations for the period		55,880		100,556
Tammy Lynn Outdoor, LLC [Member]
Amortization of intangible assets acquired for the period	$ 285,189		$ 285,189
Revenues since the acquisition date included in the consolidated statement of operations for the period	340,006		340,006
Earnings since the acquisition date included in the consolidated statement of operations for the period	(54,969)		(54,969)
Costs of acquisition included in professional fees in the consolidated statement of operations for the period	113,679		113,679
Key Outdoor, Inc [Member]
Amortization of intangible assets acquired for the period	225,200		225,200
Revenues since the acquisition date included in the consolidated statement of operations for the period	555,992		555,992
Earnings since the acquisition date included in the consolidated statement of operations for the period	(6,756)		(6,756)
Costs of acquisition included in professional fees in the consolidated statement of operations for the period	121,469		121,469
Waitt Outdoor, LLC [Member]
Amortization of intangible assets acquired for the period	400,825		400,825
Revenues since the acquisition date included in the consolidated statement of operations for the period	1,117,509		1,117,509
Earnings since the acquisition date included in the consolidated statement of operations for the period	32,312		32,312
Costs of acquisition included in professional fees in the consolidated statement of operations for the period	140,165		140,165
Tammy Lynn Outdoor, LLc, Key Outdoor, Inc and Waitt Outdoor, LLC [Member]
Amortization of intangible assets acquired for the period	911,214		911,214
Revenues since the acquisition date included in the consolidated statement of operations for the period	2,013,507		2,013,507
Earnings since the acquisition date included in the consolidated statement of operations for the period	(29,413)		(29,413)
Costs of acquisition included in professional fees in the consolidated statement of operations for the period	$ 375,313		$ 375,313
Clear Channel Outdoor Inc. [Member]
Amortization of intangible assets acquired for the period		70,846		212,539
Revenues since the acquisition date included in the consolidated statement of operations for the period		264,001		623,077
Earnings since the acquisition date included in the consolidated statement of operations for the period		24,293		(17,462)
Costs of acquisition included in professional fees in the consolidated statement of operations for the period				14,468
Hartlind Outdoor LLC [Member]
Amortization of intangible assets acquired for the period		45,770		122,054
Revenues since the acquisition date included in the consolidated statement of operations for the period		85,178		237,954
Earnings since the acquisition date included in the consolidated statement of operations for the period		21,281		77,010
Costs of acquisition included in professional fees in the consolidated statement of operations for the period				8,645
Southeastern US [Member]
Amortization of intangible assets acquired for the period		129,649		167,830
Revenues since the acquisition date included in the consolidated statement of operations for the period		238,746		244,066
Earnings since the acquisition date included in the consolidated statement of operations for the period		(30,404)		(84,447)
Costs of acquisition included in professional fees in the consolidated statement of operations for the period		27,587		49,150
Clear Channel Outdoor, Hartlind and Southeastern US [Member]
Amortization of intangible assets acquired for the period		246,265		502,423
Revenues since the acquisition date included in the consolidated statement of operations for the period		587,925		1,105,097
Earnings since the acquisition date included in the consolidated statement of operations for the period		15,170		(24,899)
Costs of acquisition included in professional fees in the consolidated statement of operations for the period		27,587		72,263
Surety Support Services, Inc [Member]
Amortization of intangible assets acquired for the period		13,749		13,749
Revenues since the acquisition date included in the consolidated statement of operations for the period		78,065		78,065
Earnings since the acquisition date included in the consolidated statement of operations for the period		(44,913)		(44,913)
Costs of acquisition included in professional fees in the consolidated statement of operations for the period		28,293		28,293
South Coast Surety Insurance Services, LLC [Member]
Amortization of intangible assets acquired for the period
Revenues since the acquisition date included in the consolidated statement of operations for the period
Earnings since the acquisition date included in the consolidated statement of operations for the period
Costs of acquisition included in professional fees in the consolidated statement of operations for the period
Free State Bonds Inc. [Member]
Amortization of intangible assets acquired for the period
Revenues since the acquisition date included in the consolidated statement of operations for the period
Earnings since the acquisition date included in the consolidated statement of operations for the period
Costs of acquisition included in professional fees in the consolidated statement of operations for the period
Surety Support Services, South Cost Surety Insurances Services LLC, and Free State Bonds Inc. [Member]
Amortization of intangible assets acquired for the period		13,749		13,749
Revenues since the acquisition date included in the consolidated statement of operations for the period		78,065		78,065
Earnings since the acquisition date included in the consolidated statement of operations for the period		(44,913)		(44,913)
Costs of acquisition included in professional fees in the consolidated statement of operations for the period		$ 28,293		$ 28,293

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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-Paragraph 2
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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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