Note 4 - Debt - Subsequent Events - Summary of Debt (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Long-term debt	$ 2,855,861	$ 3,045,421
Less current portion	2,855,861	3,045,421
Total long-term debt
Term Loan [Member]
Long-term debt	2,355,861	2,545,421
Line of Credit [Member]
Long-term debt	$ 500,000	$ 500,000

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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