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Note 11 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Beginning Balance Outstanding |  |  | Granted During Period |  |  | Exercised During Period |  |  | Canceled During Period |  |  | Ending Balance Outstanding |  |  | Exercisable |
Year ended December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | 35,250 |  |  |  | -0- |  |  |  | -0- |  |  |  | 0 |  |  |  | 35,250 |  |  |  | 35,250 |
Weighted average exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share |  | $ | 4.62 |  |  |  | -0- |  |  |  | -0- |  |  |  | -0- |  |  | $ | 4.62 |  |  | $ | 4.62 |
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | 35,250 |  |  |  | -0- |  |  |  | -0- |  |  |  | -0- |  |  |  | 35,250 |  |  |  | 35,250 |
Weighted average exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share |  | $ | 4.62 |  |  |  | -0- |  |  |  | -0- |  |  |  | -0- |  |  | $ | 4.62 |  |  | $ | 4.62 |
|  | Beginning Balance Outstanding |  |  | Granted During Period |  |  | Exercised During Period |  |  | Canceled During Period |  |  | Ending Balance Outstanding |  |  | Exercisable |
Year ended December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | 152,480 |  |  |  | -0- |  |  |  | 28,000 |  |  |  | -0- |  |  |  | 124,480 |  |  |  | 111,980 |
Weighted average exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share |  | $ | 4.35 |  |  |  | -0- |  |  |  | -0- |  |  |  | -0- |  |  | $ | 4.57 |  |  | $ | 4.56 |
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | 124,480 |  |  |  | -0- |  |  |  | -0- |  |  |  | -0- |  |  |  | 124,480 |  |  |  | 111,980 |
Weighted average exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share |  | $ | 4.35 |  |  |  | -0- |  |  |  | -0- |  |  |  | -0- |  |  | $ | 4.57 |  |  | $ | 4.56 |
|  | Beginning Balance Outstanding |  |  | Granted During Period |  |  | Exercised During Period |  |  | Canceled During Period |  |  | Ending Balance Outstanding |  |  | Exercisable |
Year ended December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | -0- |  |  |  | 100,000 |  |  |  | -0- |  |  |  | -0- |  |  |  | 100,000 |  |  |  | -0- |
Weighted average exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share |  | $ | 11.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  | 100,000 |  |  |  | -0- |  |  |  | -0- |  |  |  | -0- |  |  |  | 100,000 |  |  |  | -0- |
Weighted average exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 11.17 |  |  |  |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  |  | Options Outstanding |  |  |  |  |  |  |  |  |  |  | Options Exercisable |  |  |  |  |
Exercise Price Range |  |  | Number Outstanding |  |  | Weighted Average Remaining Contractual |  |  | Weighted Average Exercise Price |  |  | Intrinsic Value |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |  |  | Intrinsic Value |
$ | 3.00 | - | 3.99 |  |  |  | 34,000 |  |  |  | 2.95 |  |  | $ | 3.65 |  |  | $ | 218,620 |  |  |  | 34,000 |  |  | $ | 3.65 |  |  | $ | 218,620 |
$ | 4.00 | - | 4.49 |  |  |  | 15,930 |  |  |  | 5.04 |  |  | $ | 4.25 |  |  | $ | 92,872 |  |  |  | 15,930 |  |  | $ | 4.25 |  |  | $ | 92,872 |
$ | 4.50 | - | 4.99 |  |  |  | 100,000 |  |  |  | 2.78 |  |  | $ | 4.62 |  |  | $ | 546,000 |  |  |  | 75,000 |  |  | $ | 4.62 |  |  | $ | 546,000 |
$ | 5.00 | - | 7.99 |  |  |  | 9,800 |  |  |  | 6.04 |  |  | $ | 7.90 |  |  | $ | 21,364 |  |  |  | 9,800 |  |  | $ | 7.90 |  |  | $ | 21,364 |
$ | 8.00 | - | 12.00 |  |  |  | 100,000 |  |  |  | 9.80 |  |  | $ | 11.17 |  |  | $ | 0 |  |  |  | 0 |  |  | $ | 11.17 |  |  | $ | 0 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Shares of Restricted Stock |  |  | Weighted Average Grant Date Fair Value |
Unvested outstanding at January 1, 2014 |  |  | 12,000 |  |  | $ | 10.97 |
Granted |  |  | 6,400 |  |  | $ | 14.24 |
Vested |  |  | (10,400 | ) |  | $ | 12.98 |
Forfeited/Cancelled |  |  | - |  |  |  |  |
Unvested outstanding at December 31, 2014 |  |  | 8,000 |  |  | $ | 10.97 |
Granted |  |  | 9,211 |  |  | $ | 13.66 |
Vested |  |  | (13,211 | ) |  | $ | 12.84 |
Forfeited/Cancelled |  |  | - |  |  |  |  |
Unvested outstanding at December 31, 2015 |  |  | 4,000 |  |  | $ | 10.97 |
|  | Shares of Restricted Stock Units |  |  | Weighted Average Grant Date Fair Value |
Unvested outstanding at January 1, 2014 |  |  | 144,243 |  |  | $ | 11.26 |
Granted |  |  | -- |  |  |  |  |
Vested |  |  | (37,925 | ) |  | $ | 10.09 |
Forfeited/Cancelled |  |  | (2,500 | ) |  | $ | 10.71 |
Unvested outstanding at December 31, 2014 |  |  | 103,319 |  |  | $ | 11.71 |
Granted |  |  | 24,210 |  |  | $ | 14.61 |
Vested |  |  | (24,892 | ) |  | $ | 11.55 |
Forfeited/Cancelled |  |  | (8,057 | ) |  | $ | 10.54 |
Unvested outstanding at December 31, 2015 |  |  | 94,580 |  |  | $ | 12.55 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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