Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Allowance for Doubtful Accounts Receivable, Current	$ 83,000		$ 83,000		$ 34,000
Provision for Doubtful Accounts	20,000	$ 48,000	49,402	$ 86,949
Inventory Write-down	0	0	0	0
Asset Impairment Charges	$ 0	$ 0	$ 0	$ 0
Number of Outstanding Stock Based Option Awards and Warrants	5,749,433	5,120,669	5,749,433	5,120,669
Diluted Share Instruments, Intrinsic Value	$ 0		$ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0	0
Revolving Credit Facility [Member] \| Two Thousand Fourteen Credit Agreement [Member]
Unamortized Debt Issuance Expense	$ 197,000		$ 197,000
Minimum [Member]
Property, Plant and Equipment, Useful Life			5 years
Maximum [Member]
Property, Plant and Equipment, Useful Life			30 years

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The number of shares outstanding stock options awards and warrants which have a potentially dilutive impact on earnings per share as of the balance sheet date.

+ References

No definition available.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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