Note 8 - Financing Arrangement - Long-term Debt (Details) - MBT Credit Agreement [Member]	Dec. 31, 2017 USD ($)
Long-term debt, gross	$ 22,248,489
Long-term debt, gross	22,248,489
Current portion of long-term debt	2,500,000
Long-term debt, less current portion	19,748,489
Less: Unamortized deferred financing costs	(143,813)
Long-term Debt	19,604,676
Revolving Credit Facility [Member]
Long-term debt, gross	7,248,489
Long-term debt, gross	7,248,489
Term Loan A [Member]
Long-term debt, gross	10,000,000
Long-term debt, gross	10,000,000
Term Loan B [Member]
Long-term debt, gross	5,000,000
Long-term debt, gross	5,000,000
Term Loan C [Member]
Long-term debt, gross
Long-term debt, gross

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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